Suggesting that a vote for Trump is a vote for a conservative Supreme Court makes two assumptions. First, it's an assumption that Trump would actually nominate conservative judges. Mr. Trump has spent all but the last year of his public life living as a liberal democrat, endorsing liberal candidates and liberal policies. I, for one, am far from convinced that he cares about conservative beliefs. The second assumption is that the rest of the four older judges will die during the next four years. As of the moment, there is exactly one seat open. I don't trust Trump or Hillary to put in a conservative or moderate.
The more depressing idea suggested here is that I should vote for a candidate I don't want to represent me. The argument is that if I vote for a candidate I do like and my candidate doesn't win and the candidate I don't like doesn't win, than another potentially worse candidate will win. With this mindset, everyone who voted for a candidate that didn't win "wasted their vote", as if the only time your voice and opinion matter are when you have the majority. Please read the article below on the subject.
A grand total of 9% of Americans voted for Clinton and Trump in the primaries. Almost the same number voted for other candidates. Fewer than 4.5% of American's nominated Trump to represent the "conservative" political party. Why on earth does that mean that the rest of America, more than half of whom have strong dislike for both candidates, can't vote for a third party candidate? If every voting adult would actually vote based on who they want in office, not just to prevent someone they dislike more from getting in office, there is a very good chance that neither of the major party candidates would win, because they DON'T represent the will of the people.