> suspicious screenshots were found I made 2 years ago about the Iran/Israel war

> I was barred from the US for life

Getting banned for life due to wrongthink screenshots is pretty wild. No idea why screenshots would be suspicious.

> I can understand that security don't want to take any chances with people carrying supposed explosive powders on an airport, so the system was doing it's protective job.

I'd understand rejecting your entry on that day but why would they make you persona non grata forever? That seems completely out of proportion.