I threw some trash at another vehicle on the road today-because I didn't like their bumper stickers
How could you do that? Why would you throw trash at the other car?
I don't like bumper stickers about peace and cooperation and brotherhood.
Even if you disagree with someone's bumper sticker, that is no reason to throw trash at their car. Throwing things at moving vehicles can be dangerous, so that is a foolish action to take. If you don't like someone else's opinion, you should learn to control your response better and behave in a more mature, less reckless way.
It's how I show hatred against bumper stickers. There is nothing wrong with it.
I believe it's best to stop this behavior, don't you want to keep the environment clean? I don't think harming the earth is worth the anger, and you might throw something at the wrong person and get hurt yourself. How about taking deep breaths and counting to three when you see something upsetting to calm down?