Yes. You are just probably too used to it to notice.

Decades before it didn't happen as often in places it does now (yes, it did happen in other places. No excuse for a neighbourhood to go bad though, e.g. through tons of meth/opioid addicted piling to the crime rate).

In nicer neighbourhoods it doesn't happen still.

In whole countries (like Japan) it's unthinkable.

>Leaving aside small sleepy towns, everyone locks up their house, car, bicycles, and other possessions, even the people complaining about stolen packages

In my place (like in places like Tokyo or Singapore today still) we used to sleep with open windows, and had no problems even living cars unlocked. So there's that.