Why?--I'm confused, again.

Today this story from BBC about a seven day old armed conflict between the government of Lebanon and and "Islamic militants" who have taken control of a Palestinian refugee camp in Lebanon. I have lots of questions about this. Why did "Islamic militants" take over a refugee camp? How is "sending in the army" going to help de-escalate/improve the situation? And most ... strangely to me:

Why is the United States delivering military equipment to the Lebanese army as assistance for this situation?

I just don't get it. Is it kind of like we want to make sure we want to get our own whatever sized piece of the culpability for whatever innocent people die? Confused, again.

I said to Megsie "Okay, I thing I figured it out. There are lots of people in this country who are okay with accepting culpability for the death of the innocent in the name of the grand end goal of MTWABP". and she said "Oh, so the end justifies the means? Is that kind of like how the terrorists think?".

She went on to say "I think it's more understandable if you are able to realize that this is just another greedy country which is jumping into the fray. But there is this powerful myth in this country that America is somehow God's country and with good pure motives, so that kind of confuses things, because they are not behaving in a way that is consistent with that. People think they are, but then it works out to not be good for the other countries, and that's why it's confusing."

That was helpful