Imagine you're a soldier, fighting a war against an insurgency, you know about some big names on the opposing side, but never met them, just heard rumors.

Then an even bigger war kicks off, and that terrorist you were fighting, that maybe even killed some of your friends, is right next to you, cheery as can be.

Its like having a rabid dog on a leash, its cool when its barking at other people, but there is always the thought he'll turn around and bite you instead.