Way I see it...”the enemy of my enemy is my friend”. If they are indeed helping us, then we owe them some help.
But - Your point about double agents and counterintel plants, however, is well taken.
To be sure, some deaths are to be expected in shadowy spy wars. Its an extremely risky business and people get killed.
Some of them may be executed immediately by low level thugs, but much worse fates await those who are not so lucky. I think I would rather be captured by Nazis. I pity those who think that Obama stopping waterboarding is going to buy them any mercy.