This is a silly argument without any merit. We do need Bush to visit and pay respect at Rajghat unless he wants to. We should make sure they do not insult us by doing something we forbid but we cannot force them to do something to make us feel better. The fact that other people have a diffrent belief and they want to follow it does not mean they insulted us. If we consider Bush not going to Rajghat as insulting Mahatma it is a problem with our thinking.
I dont think US would force people coming from other nations to go and pay respects to some site or some church or some person.