This is the direct result of the provision that downgraded thefts under $1000 to a misdemeanor charge. Cops can’t be bothered to deal with most store thefts because in most cases arrests are not going to go anywhere.
Plus store security is not allowed to actively interact with thieves, which means they come in, take whatever they want and just walk out.
Lots of posts on /r/bayarea/ if you are curious.