I think of it as follows: Five of us in a car and we're sorting things out democratically. Two of us, including the driver, think the ride would be way more fun if the driver goy blackout drunk and wore a blindfold. Two of us want to go to Mcdonald's. You don't want to go to McDonalds and suggest a salad bar.
Well, the votes are tied and the driver and his buddy win by default and we all die in a car crash.
Yes, a salad was better than McDonalds OR a car crash but goddamn, reality is also a thing and doesn't care about what we want.
The time to push for significant change was the primaries and our fellow progressives didn't show up to vote. Voting a third party now just feels "if I don't get my way, I'm taking my ball and going home!"