As someone who voted 3rd party in 2016 and regrets it. While you are technically correct, the last 8 years have shown that there is so much more on the line than what I was protesting against with my 3rd party vote. I didn't like Hillary Clinton's positions on war. And sure, my vote probably wouldn't have mattered all that much as I live in a very red state, but every time the Supreme Court does some bullshit, I feel a bit of regret that I didn't use my vote to support the best candidate who actually had a chance.