Dear Syrian Rebels,
The rest of the world might have more sympathy for your cause if you'd stop cutting the heads off of people who disagree with you. (Yes, they did. No, you don't want to look, I just linked it as evidence I wasn't making it up).
Not shooting your prisoners in the back of the head would be good, too, but I'd take that over having my head sawed off with a combat knife.
The other reason you should stop is that you might give the IRS ideas on how to really deal with their enemies instead of just delaying and denying applications for tax exempt status.
The rest of humanity