No candidate "deserves" my vote
If you are a candidate for office, you do not "deserve" my vote. You have no claim on my vote. You have to convince me that you are the best choice. I have been a candidate in the general election three times, and I held the exact same position then as I do now. It is my job to convince you to vote for me.
Elizabeth Nolan Brown dismissed "spoiler" arguments when she expressed support for Justin Amash on Twitter, as Democrats are upset that Amash might "steal" votes from Joe Biden. Of course, as a pro-life fiscal conservative who was elected in the Tea Party wave of 2010, Amash is more likely to take votes away from Donald Trump, but that is not the point. Biden is not owed any anti-Trump votes.
As an aside: I have said repeatedly that I will vote for Trump in November and have repeatedly explained why. However, Trump is not entitled to my vote or anyone else's vote. Trump is not is not owed any Republican or conservative (or moderate) votes. No one is obligated to vote for a major-party candidate.
This applies all the way down the ballot. It is not my job to vote for a Republican candidate for any office. It is the candidate's job to convince me to vote for him by demonstrating competence, character and conservative principles. There is no such thing as a "spoiler" vote if the Republican candidate fails to accomplish that, because no candidate owns my vote. I totally reject that cult mentality.