Did the screener really think my father might wreak havoc on a planeload of people?
Short answer?
YES.
Sheesh, when are people going to stop with the "well I wouldn't..." "well my father wouldn't..." "well a senator wouldn't..." Ok, we'll just make a list of you, your parents, and all the senators, and since none of you are a threat, we'll just let you skip the screening process altogether.
Seriously, though. The moment they start making exceptions for old people/children/priests/pregnant women/etc. is when that weakness will be recognized, and likely be chosen as a method to exploit. I, for one, am all for equal opportunity screening. If you want to be excempt, that's what the "trusted traveller" program is supposed to be for.
In my opinion, the "how dare they SSSS a child" or "how dare they SSSS that old man" whining is fairly ignorant.