Why Crime Happens
Look past sensational headlines and crime fiction tropes to understand the real patterns behind unlawful behavior. Discover how environment, immediate opportunity, and life stages shape criminal events far more than pure villainy.
Like Duolingo, but for Why Crime Happens. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through The Anatomy of a Crime Event and Places and Life Paths. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Why Crime Happens
- Crime requires three elements meeting at the same time and place: a motivated offender, a suitable target, and the absence of a capable guardian
- If even one element of the triangle is missing (like guardians present on a busy street), the crime does not occur
- A quiet, empty street removes natural guardianship without changing the target's physical value
- In criminology, guardians are rarely formal police; ordinary people going about daily life deter most crimes simply by being visible
- Environmental features like good lighting act as guardians by making offenders visible to observers
- A distant police force cannot provide direct guardianship at the moment and place a crime opportunity arises
- Target suitability depends on how easy an item is to see, reach, move, and profit from (value, inertia, visibility, access)
- Inertia refers to the weight or bulk that makes an item physically difficult to steal and carry away
- Lightweight, easily concealed electronics are stolen far more often than valuable heavy furniture
- Criminologists demonstrated that post-WWII burglary spikes were driven by shifts in routine activities, particularly homes being left empty during the day as women entered the workforce
- Broader social changes (like smaller portable consumer goods and empty suburban homes) create abundant criminal opportunity without needing a sudden change in moral character
- Routine activities theory explains crime trends through changes in opportunity rather than individual criminal psychology
- Offenders make choices by weighing costs and rewards, but their thinking is bounded by limited information, quick decisions, intoxication, or emotion
- Because rationality is bounded, criminals focus far more on immediate, visible payoffs than on distant consequences
- A crime can be reasoned and purposive without being perfectly calculated or smart
- Situational crime prevention alters the immediate environment to make crime harder, riskier, or less rewarding
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Why Crime Happens the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What happens if a busy crowd provides guardians on a street where an offender spots a target?
Get it right to open this lesson and 10 more in the app.
How to learn Why Crime Happens, step by step
Go in order. 11 short levels across 2 sections, about 22 minutes in all, five minutes a day.
- 1
The Anatomy of a Crime Event
- The Triangle of Opportunity
- The Decision to Offend
- 2
Places and Life Paths
- Hot Spots and Neighborhood Ties
- Aging Out of Offending
2 sections · 4 units · 11 levels. Built to play, not to enroll.
Questions about Why Crime Happens
How do I learn Why Crime Happens?
Go in order: start with The Anatomy of a Crime Event, then Places and Life Paths. On Tomo that's 11 short levels, about 22 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for Why Crime Happens?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. Why Crime Happens is one of its free courses, and you can type any other topic to get a course of your own.
Is the Why Crime Happens course free?
Yes. Why Crime Happens is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn Why Crime Happens?
11 levels across 2 sections, about 22 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start Why Crime Happens?
No. It's pitched at a beginner level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
Why Crime Happens is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Why Crime Happens today.
Download Tomo, search Why Crime Happens, and play your first lesson in under a minute.