taxi4ballet Firstly "paedophilia" and having sex with someone under the age of consent (which is a social construct) are two different things.
Secondly yes, anyone who did the latter is at fault (even if not technically a paedophile, depending on the pubertal status of their victim(s). We have an age of consent for a reason, because we as society have decided that children are not capable of giving informed consent. If the prevailing attitude was such that groupies, including under-age ones, was a common phenomenon then it isn't unreasonable to expect the adults in the situation to ensure the recipients of their attention were both consenting and capable of giving consent.
Having crushes on celebrities is part of growing up. Children and teenagers aren't expected to always behave rationally or with considered maturity. That's why it's vital that the adults do, and that they don't take advantage of the vulnerability of children.