Crime follows money. Wether going to better-off city parts or even travelling internationally. Not only targets are more wealthy, but „you don't shit where you eat“ is important too. You don't want to accidentally rob a friend's friend's friend...

For example here in bum fuck eastern europe, after we joined Schengen, street crime dropped in no time. Lots of „street professionals“ went to much more wealthy Western europe. Some packed up and left. Others leave for tours and come back home to live on income from stolen stuff.