ISIS was rejected by Al-Qaeda for being too brutal and cruel!!!! That's like applying to Manson's "family" and being rejected because you are too nuts!!!
I am a pacifist ( I guess i will put the "fist" back into pacifist!
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1. It is in our best interest to eliminate ISIS.
2. It is the moral thing to do. The over 20,000 Yazidis will die if we do not kill the ISIS troops. The math tells us to kill all the ISIS troops on the ground *. True, killing is wrong, but to prevent a greater evil is right.
3. This is an opportunity! Most of the other Muslims hate ISIS. We can ( at least temporarily) be their allies! Thus facilitating a diplomatic solution to other problems in the middle east.
* Some may object that this is impossible to achieve. I disagree. These are well defined troops in a specific geographical area. They are not like Al-Qaeda, that is hidden. I think our bombs can eliminate a target in the middle of a relative desert.