Killing civilians is terrorism, whether or not you have a seat at the UN.
I appreciate the thoughtful way you are going about trying to make sense of the senseless. Words do matter and so you are spot on that a clear understanding of them is critically important to the process of understanding events. There is much we don't know still about this tragedy, but I think we can all agree that simply placing blame doesn't solve problems, neither does the tit for tat circular reasoning. Thanks for being courageous enough to dive into the muck.