Is it bad for kids to believe in santa claus?

Why would it? They are believing in something that presents good morals and ethics, in reality it isn't bad its good. If they believe in Santa then they also believe they have to be good in order to receive presents. To top it all off, they aren't harming anyone with their beliefs, so in short, they believe in good, they act good, the don't harm anyone, why would this be bad, it's not.