Given you fly "...120 sectors per year...", I would have thought you might have slightly more reason to thank security screeners than traffic wardens..but of course you are entitled to your view.
I also drive a lot and without traffic wardens that wouldn't work either.
Traffic wardens also operate out in the field, often without quick assistance if required.
Also, what about firemen, who risk their lives to help us and doctors/nurses who put themselves in harm's way, both physically and mentally?
My conclusion is that your argument is nonsense, screeners are not owed a debt of gratitude, they receive fair pay for fair work.