Bleeping it is fine, but I don't think people, as in Nascar officials, need to make such a big deal over it. My cousin has a protective mother and she censors movies and other things so he won't hear cuss words, but when someone says one around him, he notices it even more than someone else does. He points out the words which some of our other cousins his age don't even notice. His mom puts such an emphasis on those words, that he really notices when someone says it. Bringing this back to Nascar, if they make a big deal out of it and fine someone than kids are going to be like well is whoever going to cuss this week and get fined.
Nascar doesn't need to fine people or make a huge deal out of it, it just draws more attention to the cussing. Besides most everyone cusses, kids are going to hear it somewhere usually at home or from friends.
Edited for clarification. Because it isn't a big deal to me, I use way too many cuss words. It would help me to have a censor on my mouth, but Nascar doesn't need to worry about censoring the drivers.