In the US, some will call the correct authorities. Others simply refuse to spend their money on it.
But the bigger risk is that committing a minor crime puts you into the system. I'm going to guess it is quite easy to assume that getting arrested or fined puts you closer to being caught than not doing so. One is likely taking risk daily just by working and renting an apartment, depending on circumstance. (Naturally, some landlords don't really get information and some jobs skirt legal requirements.)
Heck, even as a legal immigrant, I'm pretty careful not to break laws that I can easily avoid breaking. I know a traffic ticket won't get me sent back to the US, but I'd rather stay on the safe side.
But the bigger risk is that committing a minor crime puts you into the system. I'm going to guess it is quite easy to assume that getting arrested or fined puts you closer to being caught than not doing so. One is likely taking risk daily just by working and renting an apartment, depending on circumstance. (Naturally, some landlords don't really get information and some jobs skirt legal requirements.)
Heck, even as a legal immigrant, I'm pretty careful not to break laws that I can easily avoid breaking. I know a traffic ticket won't get me sent back to the US, but I'd rather stay on the safe side.