It's not about intelligence.
You can be a highly intelligent, well educated, sensible person, and still get caught in something like this. All it "really" takes is wanting to be loved, accepted, treated as one of the team, one of the group. All it takes is our own basic human nature of wanting to "fit in". If a good looking and charismatic person of your choosing would walk up to you and promise you that you can fit in with people just like you, be loved and accepted as exactly who you are, and find good friends, all the support you need, and respect, just "sign here", can you seriously say you wouldn't be tempted?