Lots of criminals that are smart get caught, because even smart people fuck up sometime. When some smart guy fucks up at his e-commerce site probably there just has to be a code rollback and maybe a talking to, if a smart criminal fucks up it's probably the cops come calling.
A cop once told me "Criminals almost always get caught because of probability. The vast majority of criminals don't commit just one crime, so chances are, they will eventually get caught. To never get caught, they have to get lucky every time. I only need to get lucky once."
You met a cop who actually catches criminals? Joking aside, probability works both ways and if the police don't actually do anything about crime, low level theft etc then those criminals will never get caught.
you don't do anything about low level theft because you will catch those criminals in the act at some point, rather than investigating after the fact which takes lots of resources, and then the system will take into account that most criminals have committed many crimes before being caught.
Doubt it is plenty. Because it either means you need to fly under the radar for the rest of your life (never cross borders, never be stopped, never use a bank account etc) or you need to manage to create a new identity which in itself is not very easy.