I will preface my comments by saying that as flight crew, I am frequently furstrated by the security process and how it affects us. I do try my hardest to play along to minimize the pain.
I feel badly for this pilot having been taken off the aircraft in the manner that apparently was used. It would have been better if a little more discretion would have been applied. But, to suggest that security personnel have no business coming forward when they perceive a threat to the public safety, such as a flight crew member who may be under the influence of alcohol or drugs, is bordering on the absurd. It is the duty of all citizens to come forward when we see something which could put our fellow citizens in jeopardy. The appropriate authorities must then act in a responsible manner to deal with the threat effectively.
JMHO.
Jeff