My take on the down votes is that it is dangerous to spread ideas about voting third party in a democracy with an election system that mechanically only supports two parties.
Even if you’re in a “safe” state, people from states that are more in the margins may hear the sentiment and want to participate out of principle. It makes the opposition more likely to win.
If we want the Democrats to win in the end, it’s safer to be pushing for engagement on all fronts. That’s what the Republicans are doing and they can actually be trusted to vote.