The primary reason I object to mandatory removal of a blazer or jacket is that it must then be crumpled into a filthy bin. That's not consistent with the way I treat my clothing.
On top of that, of course, is the risk-avoidance nature of requiring people to undress at checkpoints.
But Idiot Hawley and ...-Clown Chertoff don't care about passengers. Gotta push people around just because they can. What an expensive, terrible joke.