I don't think profane bumper stickers should be allowed. Our society lacks decency, in my opinion.
But arrested? That's absurd. I think a ticket with a small fine would be more than adequate. This is America, we should not be arresting people for bad words.
Edit: Her warrant and arrest was for fraud, but the sheriff threatened to press charges for the sticker, which is crazy.
2nd edit: You know, I take it back. The woman is irresponsible and immature, and I would not want to associate with her. But you can't really regulate the words people put on their own possessions. Who would make the list of banned words?
But I really can't stand that type of person. It's like the guy who blasts profane rap music in parking lots.