Clearly we are not about to agree.
I'd argue they engender more war.
We can "kill people who need to be killed" now, but keep in mind that a) they are rarely the only people to be killed/raped/maimed and b) even those we decide need to be killed, and may, in fact, need to be killed, are still fathers, sons, brothers, husbands. After everyone we decide needs to be killed is killed, there will be a generation of children who will have witnessed us invading their country, bombing their homes, raping their mothers (and sisters -- the most recent one being investigated by the US military was 15), killing their fathers and running around like we own the place. You don't believe this generation will grow up to hate us, to lash back at us, exactly as you or I would if another nation did this to our families? Then we'll have a new generation of terrorists and 'people who need to be killed.'
I don't consider myself a priest of a peace cult. But at this rate, Middle Eastern conflicts between Jews and Muslims will be over only when there is nothing left in the region but dust. Africans die at war every day and no one in the entire world gives a damn. This is an immense amount of human suffering, and as a profession interested in easing human suffering, I believe doctors do, or can - I'm not trying to argue for a forced entry into the 'priesthood'- play a role in this. Don't care about those/they're people who need to be killed? Fine. We have innocent American young men dying daily in an unwinnable war that's had little to no effect on our safety. No one knows quite what the goal is, nor the plan to get there.
Many of these men and women either become patients of American doctors when they are wounded in the field, or they complete their tour of duty, return, and are patients of American doctors when they return, and have long term health consequences that could have been prevented. I believe that in this case, our government is doing our nation's young people a great disservice for no purpose. I think it's perfectly valid for doctors to play a part in the discussion.
Politics definitely has no part in any of those places. But...not all medicine is practiced in an operating room. I argue that any pediatrician, internist, family practicioner, obstetrician, or psychiatrist, at the very least, is not doing their job if they are not thinking of prevention. This means thinking outside the OR, maybe outside the clinic, even, about threats to your patients' well being beyond the details and specific treatments for one system given within 20 minutes within the walls of the office.