Okay, I will concede the point that you are not permitted to put pictures on trucks that you are not permitted to put in any other public place. I guess if they pass a law that forbids the showing of pictures of other things removed from the body in a public place, they will be able to outlaw these pictures as well. But for now, it is perfectly legal.
And since it's perfectly legal, that makes it okay. I getcha.
Do you apply the same logic to abortion? After all, it's perfectly legal.