Uh... they're still people. They like doing good rewarding things and they like learning real skills.
In this case they aren't ever in neighborhoods spraying down homes. These are the guys in hills cutting fire breaks to stop the fires from ever reaching homes.
None of these fire fighters are forced. Its a job that they earn privileges for doing. They're probably not as gung-ho about it as someone who's made a career of it but they aren't slaves like you're imagining.
I was gonna say that it would only be unfortunate due to giving them a reason to attack Iran, but history has shown us that doesn't matter. We'll do that regardless. If we dont have a reason we've been happy to just make one up.
At this point its really just a matter of not wanting to actually fight America on the battlefield.