Disgust could be expressed by writing in a candidate. They won't win but at least it would send a message to the political class if the highest amount of write-in votes were ever recorded on ballots. If you think Trump or Hillary is the best candidate then vote for them. If you think they're terrible there is no need to vote for the least terrible. Not knowing anything about the conflict in Syria pretty much eliminates Johnson as a vote-worthy candidate. Hillary would be terrible for AK continuing the policies of locking up more federal lands. Trump is a foul-mouthed jerk. Not much for options there.