OK John, I'll go along with all the stuff you said about parental responsibility.
On the other hand, if you had been tailgated on the Autobahn as many times as I have been in Germany (while overtaking lines of lorríes) you would understand why I want to vapourise those bastards who drive close when my kids are in the car. A car sticker is a very mild statement compared to what I say to those assholes who race up and down streets which my small children have to cross.
To my knowledge car stickers are responsible for a fairly low number of casualties.