Its fine to side with one pack of muslims when its in our advantage and great to sweet talk them and stuff. But, you shouldn't get caught up in foolishly trusting them. They are siding with us because we kick ass, not because they are any more moral than the other muslims.

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Qur'an:8:39 Fight them until all opposition ends and all submit to Allah.
Qur'an:8:67 It is not fitting for any prophet to have prisoners until he has made a great slaughter in the land.
Qur'an 8:12 I will terrorize the unbelievers...Strike off their heads and cut off each of their fingers and toes.
Qur'an 9:5 Fight and kill the disbelievers wherever you find them, take them captive, torture them, and lie in wait and ambush them using every stratagem of war.