This simply shouldn't be allowed, regardless of what you think of the candidate.
No. It should be allowed. There should always be a check on the masses.
Why even have elections?
Why have an electoral college? I agree that this is a pointless and dumb idea by the elector, but what's the college's point if electors are 100% bound? That might as well by a PV election, then.
Well first, having an electoral college comprised solely of bound electors would still be different than a straight PV election. But more importantly, preserving tradition is important, we can't just take an iconoclast view of government and start tearing down whatever institution we feel is outdated.
The votes cast by faithless electors through history, when looking back, tell us a lot about that election. I don't feel there's a need to bind electors, but openly threatening to defy the voters because of a bogus "conscience" reason is ridiculous, since electors do not exist to express their individual conscience, even if there was a conscience issue. Endorsing that kind of thinking is just as outrageous.