I do not think ANYONE should be stealing delegates. Even the idea of unbound delegates is queasy.
In this day and age when we can communicate and study the candidates, there should never be a last minute bait and switch candidate.
Unbound delegates do not reflect the will of the voters, only the party hacks who appoint them. Voters do not vote for delegates, they vote for candidates. The delegates should be appointed by the candidate who won them, in all states.