At the TOS; there were many anti-Romneyites, a lot of the kinds of statements that "I can't vote for Mitt", is probably why we got Trump in the first place. Romney should have been elected and we would not have had this disastrous 2nd term of Obama.
So, being a team player, being loyal is important too.
While I respect their view, to never be able to vote for whomever is nominated certainly doesn't accomplish much in my view.