I'm not seeing where that poster told anyone to 'quite their job'...yes, a bit back they suggested that if someone doesn't like a certain proceedure that is necessary in their job, then they may want to rethink that job, but I don't see that as trying to provoke anyone's anger. It actually makes sense. Everyone has to weigh what is involved in their jobs and decide if all policies/proceedures are going to be livable for them. If something is not, then they need to decide if it may be worth looking for another job.
As far as who goes through screening....every single person that goes past security at an airport, be it pilot, passenger, FA, baggage person, or the person who cleans the cabin in between flights. Every single person is a 'possible' terrorist. There have been plenty of articles about ground crew bringing items to the work area with them that would not be allowed past security. Security is security....should be the same for everyone.
And again I will say.....is this the perfect answer to airline security? Of course it isn't. Someday, at some point down the road, we are going to look back at this period and laugh at what we thought 'secure' was. Something better is going to come along. But for the time being, this is what we've got and this is what we have to work with. Everyone is given several options for passing through the security area. Up to each person to decide how they want to proceed. You prefer to be patted down? Fine. I don't. I prefer that wonderful 'picture' of me. I really don't care for a strangers hands all over me. But, that's MY choice. You are more than free to make your own choices. There is no right way or wrong way.