> Security checks on the pilots are not attempting to prevent pilots from causing harm-- they are attempting to close a loophole which would allow people impersonating pilots to do harm.

Wouldn't fingerprints be enough to avoid identity theft?

Among less or more technical means to clone somebodys fingerprints to fool the reader there is circumventing method involving the axe.

I've heard this method was used in Asia by some car thieves.

Gasp! :-|

However, security officers would block anyone trying to pass past security checks using chopped off fingers or fake ones.

How is scanning his body and frisking him going to help identifying him?

It's not going to help identify him.

It's going to help limit the damage if somebody impersonates him, by making sure they don't have a bomb/gun/what-have-you.

You do get this, don't you?

Of course he does, but he won't admit it because it dents his argument and won't get him any upvotes.

They hopefully would've noticed the speargun he was carrying?

He was in uniform, maybe, but he was not in charge of flying anything that day. So he was a passenger that day (in a pilot uniform).