So, if our allies have enemies, we add them to our list.
Thats dumb.
What if our allie with the enemies on his list, got his enemies on his list from one of their allies on their list, etc etc etc.
It would just go on and on and on.
"Sex is like a velociraptor: Despite your movie-fueled lifelong neurotic obsession, it is unlikely to be found in your house." ~XKCD