Because - and this bears repeating - despite all you say, we still lost the election.
And it's also worth noting that the same people who insist there must be no criticism of Hillary Clinton or her campaign or its strategists, seem to have no problem weaving elaborate narratives about how Bernie and his "Bros" damaged her irreprably by having the temerity to mount a vigorous primary challenge.
Looking forward, what can we do better, how can we appeal to more voters? Even those relatively straightforward and obvious questions seem to piss a contingent here, off. We aren't supposed to consider how to appeal to any Trump voters, anywhere, even the Rust Belt, because fuck those people and here's a long list of everything that's wrong with them since they voted for DT. Fine, I can live with that.
So someone asks "how can we expand our voter base"- my perfectly logical suggestion to that is, okay, we have the Hillary voters, we say "screw you" to the Trump voters- who is left? If you're going by the people who actually went to the polls, by my math the next-largest slice is the Gary Johnson voters. Why not look there? The GOP will undoubtedly skew towards authoritarianism, like they always do, which I should think would leave us a big opening among voters who support the bill of rights, personal freedom, choice, etc. Obviously we aren't likely to get a ton of traction among the hard-core econo-Randroids, but the rest of them?
By reminding people that real progressives support personal freedom, the right of consenting adults to make their own decisions about their own bodies, ending the drug war/fully embracing marijuana legalization, marriage equality, opposing things like censorship of what consenting adults can watch or read.. pushing back against noxious and intrusive theocratic laws- really, it seems a natural fit.
But that suggestion seems to get stony silence, or worse. It really seems to bother a few people, even. Not sure why. 
Hmmmmm.
After people get through "Greens are deluded assholes, Trump Voters are racists, and Libertarians are just idiot Republicans who smoke pot har har hyuk"... who, exactly, do they think is left besides those of us already on board?
The point is, arguing "what we've been doing is perfectly fine and how dare you suggest there is any room for improvement"- seems a bit, um, unrealistic. We can't fix Gerrymandering, or voter suppression for that matter, without winning some elections first, either.
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