Voting Libertarian will result in Donald Trump becoming our next president. If you truly believe showing your support for a Libertarian candidate is more important than making sure a raging lunatic doesn't become president, then certainly do vote Libertarian. Just don't come screaming about losing freedoms when he implements the official Republican platform (ban all abortions, ban all drugs including marijuana, ban same sex marriage, ban adoption by same sex couples, teach the bible in public schools...I could go on).

In my opinion there are  much better ways, which much better outcomes. Show support for Libertarian candidates in polls, on the ground, in your community. Making Donald Trump president is not a good outcome, in my opinion.