A couple of things...
if I was buying a ticket on a private airline and had to go through that company's private screening security system, then I'd say "hey, I'm choosing to do this".
However, If I am buying a ticket to fly on a private airline and the federal government is searching me and my baggage, I truly feel every single time that it is a violation of my rights as a US citizen.
That's the difference, private agency for a private business, versus random search and seizure by a federal entity at a private business.
Also, I had a TSA agent "confiscate" a hat from my suitcase in front of me because my hat was a danger to society. He just wanted my freaking hat and I still feel resentful about this. If this had been a private entity, I could have complained, but as it was a federal agent, I'm supposed to not argue.
Next, I spent several months on federal grand jury duty. Was screened every morning, along with regular employees at the court house, and fellow jurists and even the lawyers and their clients. I had on my key chain a razor blade (window punch). I went through security every single day for months with no problems. I didn't even realize I had it on my key chain until after the fact. That makes me feel warm and fuzzy and awfully secure. How about you?
These type of things do not make you secure. These type of things blind to the lack of control and freedom you have. "Oh I'm scared, therefore the government must protect me." This type of mentality brainwashes you into surrendering your rights for no valid reason.