Probably because, like many of us, he has had a number of infuriating interactions with TSA personnel who simply do not follow procedure nor treat passengers in anything resembling a respectful and courteous manner. Those kinds of impressions last much longer than the good encounters, logical or not it's a fact of life. Since we are not allowed (under penalty) to 're-educate' such screeners on the spot, venting here is a tempting substitute.

But I agree, this forum ought to be able to recognize it happens, will continue to happen and that it is not necessary to waste bandwidth simply for the purpose of hurling epithets (particularly if they are not innovative ones ).