Not directly related, but this reminds me of something that happened a few years back to Mrs MJ.
After repeated theft of worthless items (toys left by the kids) from her car that involved smashing a side window, she decided to simply leave the car parked in the street unlocked at night, on the premise that there wasn't anything worth stealing anyway but at least the thieves won't be breaking the glass again.
This arrangement seems to have worked well for a while, until one fine day when she was about to drive the kids to school and found a homeless person fast a sleep in her car, sleeping bag and all. I came outside and had a word with the chap, turns out he was a young Irish lad that left home to try his luck in the Big Smoke. He had a five pound note and a mobile phone on his person... I wished him well and off he went.
Back to the OP... sorry to hear this. We live in a sad world where some people just can't be bothered to engage in productive work and try and better themselves through gainful employment, instead they try to feed off the hard work of others. On the plus side, it's only metal and plastic (yes, I know, I love my car too..) and will get sorted by your insurer. Life goes on...