I've always avoided overt political stickers on my vehicles because I think it's an invitation to road rage and vandalism in our hyper partisan society. I also think most issues are more nuanced than bumper sticker slogans.

I hope we can agree that damaging other people's property isn't political speech, it's just vandalism.

Philanthropy may be a tax haven and it may be for reputation polishing or a little bit of both. Some might even just be people putting their money where their mouth is. NGOs that receive taxpayer money in a modern day spoils system without accountability for the judicious use of said public money are a different kettle of fish. That's especially true if the money is recycled into the campaign coffers of politicians. That just adds a whole new dimension of corruption regardless of which side of an issue one is on.