Recent revisions to the TSA screening practices now force victims (yes, victims) to choose between a body scan that essentially allows TSA agents to see you naked
This scan doesn't show the naked body, it shows the outline of the body, much like an X-ray. Saying it shows you naked is an exaggeration.
or between a pat-down where they, by every conceivable definition of the word, molest you. There's an example on YouTube (Meg McLain Singled out by the TSA, Cuffed to a Chair, Her Ticket Ripped up) of a girl trying to ask the TSA agents some questions about the pat-down procedure before they performed it on her. You should watch the full video, because what the TSA agents did doesn't sound far off from rape. They also handcuffed her to a chair and ripped up her ticket (something they don't have the authority to do).
Just watched some of that video, when I realised it was just her talking, I stopped watching. Anyone can make that claim, where's the evidence? I could call someone right now and make up a story about how I was "nearly molested" I'm not going to take some YouTube video and treat it as credible evidence. Even if that did happen, it's illegal and not condoned by anyone. Individuals can take action themselves and it doesn't represent the intentions of the whole organisation. If one, two, or even one hundred police officers turned out to be corrupt, it doesn't mean that the entire police force is corrupt. There are laws covering this (I'm sure that a strip search can only be conducted by someone of the same sex) and any breach of the law is the fault of the individual.
The clincher is that nearly everyone I've talked to or heard from in the airline or security fields says that procedures like these don't actually accomplish anything. It has been termed "security theater" because, rather than actually doing anything useful, it just shows that the money going to the TSA is actually being used for something, useful or not. Rather, those that I have heard from have said that these sort of searches never turn up anything that a normal pat-down wouldn't.
"These types of searches" I'm not sure what type you are referring to here. Could you clarify?
I've also been told by those in the know that substance bans are equally useless, which seems apparent given that every time one substance is banned, the terrorists simply switch to some other bomb-making substance.
"Those in the know" who? But yes, obviously they will switch substances so they can try and get past the barriers. But there's really no effective way to prevent that. At least banning such substances makes it a little more difficult for any terrorists. If they didn't ban such substances then terrorists would have no trouble at all, so even if the most effective measure still isn't very effective at all, it still has to be put into practice.
Do you feel that the TSA is justified in doing this?
Searching people? Of course it's justified. Doing what the video described? Well if such an event did actually take place, that's breaking the law, so it's certainly not justified.
What do you feel should be done?
Report any felonies to a higher authority, either the police or TSA themselves. I highly doubt the big bosses over at TSA would support such actions.