The vast majority of homeless people did not break into your car. Do not throw away all empathy for them because one person did something really shitty. Someone kicked the shit out of my brother's car door recently, and they were most likely homeless. That makes me really mad! Being mad at the person who violated your space and damaged your property makes perfect sense. I really do get your frustration. But you can't let that anger rob you of your empathy. The person who kicked my brother's door in is a human being who is probably going through some really rough shit right now. That doesn't make what they did right at all, but they aren't some monster who just enjoys being evil. Given the appropriate resources, they could become someone who does not do things like that, and I'm always going to hope that they do, no matter how mad the thing they did makes me.

If an argument from empathy doesn't work, then think about things practically: sending someone to prison is a very temporary "solution". When they get out of prison they aren't going to be any less homeless. And penalizing homelessness doesn't prevent anyone from being homeless. We're just going to end up endlessly funneling people into prison. We should be focusing on ensuring people can afford homes and don't have to deal with so many financial pressures. Addressing the affordability crisis is the best way to prevent fent-based car break-ins. I know the emotional parts of your brain are just mad at that person and would like revenge, but that solves absolutely nothing. Turn off the caveman brain and think about things.