Well I have to step in here.
You leave your car outside and there are all manor of issues that can happen to it, cosmetic and othewise.
Dude, get a cover and be done with this issue, as well as bird poop, eggs, and the rest. You are STILL at risk for the human issues but that is the nature of the society we live in today.
Now, as for the threats to kill the cats, lets lay off this topic. You guys already have seen my cat, so you have to know this might be incendary.
Lets respect our little fuzzy friends.
Thanks