Leftists have been doing this strategy for a couple decades now

OBJECTION!

What actual evidence do you have of this claim?

This gets thrown around all the time as "conventional wisdom," but it's never actually backed up by anything. In fact, the Libertarian Party typically gets roughly three times the number of votes as the Green Party, and the last major third party candidate, Ross Perot, split the Republican vote leading to Clinton's election.

More recently, the 2016 election had two major "outsider" candidates. Of them, Trump refused to rule out a third party run, while Sanders went all out campaigning for Clinton, despite all the shenanigans with superdelegates.

Only in 2024 can I see a credible case that some of the left has begun using the stubborn, "my way or the highway" tactics that the right has been employing for decades - with a high degree of success, I might add! The Republican Party has shifted further and further right to accommodate the demands of their base, because they know that if they're soft on things like guns or abortion, significant portions of their base will denounce them as RINOs and sit out or vote third party. The Democratic Party, by contrast, knows that they can always count on the left to flinch, to be "reasonable," to accept the "lesser evil," and so they have moved further right as well, taking those votes for granted.

Again, every piece of actual evidence contradicts this "conventional wisdom," which only exists in the first place because liberals are so preoccupied with the idea that someone, somewhere, might choose to stand on principle rather than fall in line. Meanwhile, people on the right are constantly choosing to die on the dumbest, most petty hills imaginable.