This statement about Joe Biden is just silly word play and the worst kind of logical fallacy.
I’ll rephrase it:
If [person X] becomes [Y], then [Z happens], it’s won’t be because good people didn’t [Action 1], but because X failed to [Action 2].
Now let’s fill in the blanks.
If Joe Biden becomes the fire chief and a fire burns down a house, it won’t be because good people didn’t throw their bucket of water, but because Biden failed to convince those people that they should throw their bucket of water.
A Trump victory will increase the number and force of the right wing policies that progressives oppose.
In what logical universe do people vote against their own prinicples?