Racking your bike

I have a question for you guys. In a race that does not assign rack space by race number, is it "wrong" to rack your bike on a rack other than the one provided for your age group? I run in to this at almost every race my daughter does. We get there early, 60-90 minutes before race start. My daughter sets up her transition area very carefully and then we head out. We always come back to check her set-up right before we head down for the start and at nearly every race her stuff is movedor pushed aside. Because her age group has fewer participants, this is usually done by people in other age groups that arrived too late to get a spot on their own age group rack(I know, I have watched nearby several times to see who it was that was so inconsiderate of another person's belongings). One time some guy racked his bike literally on top of my daughters bike, the handlebars were overlapped. Because my daughter was out of the water first, she really struggle to get her bike out from under this guys bike. Last season was her first doing adult races and we looked at every race as a learning experience. But I am not feeling so generous this year and I am wondering what is the best way to deal with this kind of stuff. I have taught my daughter to respect other people's property and I think that she deserves the same respect.