Killing one person is murder, killing 100,000 is foreign policy
Genocides in history - Wikipedia, the free encyclopedia
How many of these did the US stop?
Non-Muslims are being beheaded because they don't adhere to the "peaceful religion" doctrine and you support the Obama strategy of allowing it to continue.
Keep feeling all warm and fuzzy.
Saddam is the more interesting question, and one I honestly don't know about. It has nothing to do with the perceived strength of the Iraqi military under Saddam, but more so with the Sunnis. ISIS wouldn't of gotten anywhere without the support (passive or otherwise) of the local Sunnis. And they were pretty well taken care of during Saddam reign. Would the Sunnis of still risen up purely based on religious reason? I don't know, but I doubt it.
In the beginning when we were arming Syrian rebels, it's obvious now that not a lot of care was taken to make sure the right rebels were getting equipment. That being said, we're not now (intentionally) arming ISIS. In case you missed the memo, we did start air strikes on them you know...