I grew up in New York City in the 1980s which was a high-crime period. I was personally subject to a fair amount of property theft, and became very sensitized to these issues. After moving out of NYC, and getting older, and crime in the US dropping in general, I let go of some anxiety around theft. However, there are some very minor things that help me.

For example, if I ride my bike to a coffee shop, I'll leave outside unlocked, but in view through the window and flip it over on its seat and handlebars. Or thread my helmet strap through the wheel.

My feeling is that little things like that will reduce the likely hood of theft.

Likewise, if I leave my laptop (in a laptop bag) in my car for a bit, I'll throw a jacket over it.