In any of the states on the left coast, voting Libertarian for POTUS doesn't hurt the chances of any GOP candidate one iota.
Oregon, Washington, California all are 'winner take all' states with regards to the electoral college. They all went to Obama and they all went to Clinton. Voting for the GOP POTUS candidate is a wasted vote if you were voting Republican to vote against the Democratic candidate, because your vote didn't count.
Great
So what is your solution?