You're seeing this everywhere. Chicago, Philadelphia, and so on - although the problem may be worse in San Francisco. Cities are struggling in the post-pandemic era as the rising cost of living due to inflation in food and other essentials has driven more criminal activity, mostly around theft. This is happening at the same time where many cities are also trying more progressive, reform-based approaches to policing a…
I don't think the cost of living has anything to do with it. There was a huge boom in delivery services during the pandemic, and rapid transition from bicycles to far more valuable electric scooters. There's just far more opportunity for theft.
I live in San Jose, not San Francisco, but I really don't notice its any less pleasant to visit the city now compared to 2008 when I moved to California. And while things do get stolen in San Jose, it feels a lot less crimey than 1990s East Coast cities that I lived in back then (I left a bike on the VTA once, and did not get it back; I've had bikes I left in my front driveway unlocked for overnight and had them stolen). Beater bikes that are locked, for example, are mostly safe. And just don't buy a multi-thousand dollar bike in a culture with rampant inequality, it is impolite. It's like making out with your partner in front of someone that's just lost the love of their life.