This kind of BS needs to end. People who spread this kind of rhetoric are at least partly responsible for the monopoly the two party system has on our government.
So what are you going to do, create a law that states you can't vote for the purpose of keeping a contender out?
If the political views on both sides were closer, there may be room for a third candidate. But our country is drifting further and further apart in political ideology. On the right, people want to go further right into the Tea Party direction. On the left, they want to go toward Socialism and Communism. People on either side want to make sure the other side has no ability to take the country in their direction.
The main concern for us on the right (and should be for the entire country) are the Supreme Court justices. If Hillary is able to turn the court into a leftist rubber stamp court, then our country is finished. It's likely we will lose our gun rights. It's likely we will be flooded with immigrants that will eventually be allowed to vote securing a single-party country for generations to come. We will be done as a free country.
That's not worth the gamble just to say I voted a third party candidate. There is way too much on the line right now. We have to keep Hillary out of that White House no matter what.