Speaking as a former Prosecutor, and while it sounds like it may be politically motivated, are you sure? I had the same thing happen in 2004 (my car had Bush stickers, etc.) and we later discovered it was just some idiot teenagers slashing tires.
having said that, what I would suggest (if convenient, etc) is to mount a hidden camera to watch your vehicle. They are pretty inexpensive, small, and can be hooked into your cpu with everything recorded on your hard drive. I’d recommend an external hard drive so it doesn’t fill up your main drive.
Just a thought. Sorry to hear it happened. Been there, as they say.
You could be right. I have had most of those stickers on my car for years now. The size of the knife that did the damage is scary though. Like Bowie knife sized.