What is WRONG with people? Seriously. If I pulled up behind someone with that sticker on their window and I had my 6yr old grandson with me, I'd be hard pressed to explain that to him...AND the miscreant driving the vehicle!
The world is not about the individual and his/her freedoms. It's about human beings having to live together and share this planet. One person's freedoms should not cost another's theirs. (1 Corinthians 8:13)
Return evil for evil to no one...as far as it depends upon YOU, be peaceable with all men. Romans 12:17, 18