The fact that you refer to these people as "enemies" tells me that you have a very immature "Us vs. Them" attitude. And I think that a lot of these people you are claiming to weed out from the friend group have probably have done the same to you before you did.I suppose it's possible, but I don't think it's desirable. Why would I want to befriend and potentially benefit or find myself vulnerable to the people associated with the cause of my enemies? I have a feeling this is more an I/E thing, though. I'm fairly selective about my friends.