First of all, just because our country is the most bountiful and powerful doesn't mean that we are the only country to help others (you know that). Second (using an excerpt from nato.int) NATO promotes democratic values and enables members to consult and cooperate on defence and security-related issues to solve problems, build trust and, in the long run, prevent conflict. Even though not all representatives (any person of power in NATO) may wholeheartedly believe in protecting other countries, it is a human duty to save lives. God is some ways commands it of us; even if he didn't, I would (if in power) strive to protect the vulnerable. Now, I don't know anything about the struggle between the Kurds and Damascus, but I hope it gets sorted out soon.