Imperial boomerang. After enabling Israel/IDF which routinely just shoots unarmed people and officials on all levels simply justify it with "Terrorists.", and also routinely denies ambulance access to victims shots, it was only a matter of time until such and similar tactics come back home. Because politicians back home saw that the world was okay with it, so why not do it home.
People are supposed to defend their rights from far away, so that they don't have to defend them uncomfortably close when it's too late to avoid many casualties.
Leaving that bit of history out certain seems like a missed point of history, and absent that your parent post's point might indeed seem a little reach-y.
But “scapegoat”?
“Israel did 9/11” is treating them as a scapegoat. “IDF often calls men they killed terrorists with no justification” is just stating a fact.