I am aware of that. However, you have to remember context.That is not what you claimed. What you claimed was "No Americans have experienced being mistreated by the army."
Even if I was wrong, and that Americans have been mistreated by the army, unless this mistreatment would make people be afraid to go to the polls (which they shouldn't have to anyway, because mail-in ballots exist), then it is irrelevant.
You could say "The army kicked me out of my house and bought my land out from under me under eminent domain! I was mistreated!", but that doesn't mean you're necessarily intimidated and scared of the army so that you can't vote. Context.
But yes, I was wrong, The army mistreated Americans, but not in any way that would cause them to be intimidated and not go vote (which again, even if they were intimidated in such a way, there's always mail-in ballots).