Are the Democrats not a political party seeking to solicit votes from the public in pursuit of electoral office? Did they not fail in this endeavor? Unless your contention is that the Democrats actually won the election and Trump cheated (Blue MAGA?), then yes they deserve blame for losing, especially given this:
I don't know if you're speaking from the perspective of a member of the public or as a Democratic Operative, but either way, saying the public deserve to get burned by Trump is just cruel and pathetic defeatism in the name of defending the honor of Democratic Party elites who failed to do the job they willingly took up. If they have that defeatist, blame-shifting perspective in the face of an L they shouldn't have even run in the first place and should step aside for people who actually want to win.