LA is a different beast. They will take you to an atm and withdraw cash. So just having a card doesn't help.Yep I have received dodgy calls and emails, you just hang up or delete.
I have also been approached by many scammers in person, and had several near misses (especially in LA) where I believe I was very close to being robbed.
Criminals will always follow the money, as we go digital more so will crime, but crime has always been there.
I'm sure robbery is on the increase there. But they are also fraud city.
I use to carry 2 wallets around. One to throw to the robbers. The other with all the important stuff.
That being said, I walked from down town LA up to the Hollywood hills with no trouble.
US crime is largely a political issue though. Democrats seem to have lost their minds on policing. Gun culture also makes it difficult.