MileHi ~ Normalcy Bias
How much more a fool's paradise is it when one says something can't happen even though it has happened multiple times before?
I don't think most folks believe the “military” has gone against “citizens”. The National Guard has maybe put down some “hippies” or other riff-raff to “restore order”. But surely that could never happen to them. They are not hippies or riff-raff after all.
That is also why I love authoritarian “conservatives” who love government force so long at is used against “them”.