This is a great point. It is quite clear that some TSA clerks see any hiccup, any pushback by passengers asserting their rights or reasonably objecting to some behavior or demand by the clerk as hostility or something else illegal for which they should be punished. It points to the unpreparedness on the part of these clerks for any interpersonal interactions with passengers and they get frustrated, angry, or threatened when the packages they are processing don't just go meekly down the "conveyor belt". The issue I believe, is that TSA does not hire personnel who are capable of relating to the passengers effectively in these situation nor does TSA train them. So situations escalate till some TSA adult arrives on the scene. People with bad skills in these areas need to be eliminated and replaced with others who can deal with passengers in difficult circumstances. That would happen only if this were somewhat important to TSA, which it probably isn't. HQ can live with these occasional "dust-ups" since they are "one-offs" (Pisthole), even though the situations can be very devastating to the passengers involved in them. The only way I can see to make the screening process much more closely monitored with zero tolerance for passenger abuse is to give the function back to airlines and tie that behavior directly to an impact on the airline's bottom line.