If you don't see anything wrong with forcing someone to go to a private room alone, then I don't think that I can explain to you the issue. Nor is it about someone being 'sad'.

And if you had dared to try and hug me I would have definitely have lodged a complaint.

As to how to screen, I have said many times that the TSA needs to take lessons from other countries, but is too arrogant to do so.