Try thinking about it this way.
You have a belief (that the most important thing is defeating Trump). You have a group of people you want to convince of this belief (progressives) and adopt an action you believe is optimal (voting for Dem candidate no matter who). Now, think about what tactics can best achieve your goal.
It never ceases to amaze me that people who want to get people to take a certain action seem to think the way to get people to take that action is by condescending or talking down to them. I don't think some of you realize how your tone and the way you present your case is literally working against your desired goal.
I might be in a unique position 2020 where i might be living in somewhere like Ohio for a year. I'd have the option of keeping my vote in California where the Dem is going to win by 4.5 million no matter what and I can write in whomever I want or switching my registration to swing state like Ohio and potentially voting for the Dem nominee no matter who it is.
Do you really think the tone that you use here (the same that Pelosi, Schumer, Biden, HRC use) is really going to convince people in my position that we should just vote how others want us to because we are getting insulted?
If you really care about winning the election in 2020 please take the time to watch this:
https://www.uctv.tv/shows/George-Lakoff-on-Moral-Politics-How-Liberals-and-Conservatives-Think-11194