It’s progressives that protest by abstention and vote third-party when they don’t get an ideal candidate.
In 2008, when centrists didn’t get their absolute very first choice, they formed a PAC to get McCain elected. A greater percentage of Sanders supporters came out to vote for Clinton than Clinton supporters came out to vote for Obama.
Turnout cost Democrats the election in 2016,
Running the single worst candidate who ever drew breath did that. Clinton earned her loss.