Yes, they are. "Just following orders" does not hold any water:
http://en.wikipedia.org/wiki/Superior_orders#Nuremberg_Trial...
"The fact that a person acted pursuant to order of his Government or of a superior does not relieve him from responsibility under international law, provided a moral choice was in fact possible to him."
"so be polite to them"
No, THEY should be polite to ME. They are public servants.
Also, TSA employees are human beings, not robots designed to ignore impolite behaviour and programmed to always deliver polite behaviour. As a fellow intelligent human beings we must understand our own limitations and the limitations of the world in which we live, and strive for mutual understanding rather than wear an attitude of self entitlement.
Touching another person's genitals without permission is sexual assault, and many people will not put themselves in that predicament.
BTW, the first time I went through the backscatter scanner, I had a killer sinus headache within about 30 seconds. I went from feeling great to shitty almost instantly. Anyone else experience this? I have refused (opted out of) the scanner ever since. My many opt-out experiences have all been OK: a quick personal search and I am on my way. That is what I recommend to my friends and family to do.
BTW, part 2: the TSA corporation employees at the security checkpoints are not the problem, so be polite to them. The problem is the bribery and corruption that lead to the privatization of airport security.