As a party, the Dems suck. Absolutely. And in the long-term, as an opposition party, they are not great.
That being said, are the non-voters and protest non-voters children? The nonsense I'm reading about non-voters not being "inspired" or not being "captured" by Democrats to convince them to vote against fascism sounds like a description of a salesman trying to sell products, not the either-or choice being given to every adult American, which is, as a citizen, their own goddamn responsibility to be party to.
A non-vote is still a vote. You don't absolve yourself of the outcome by choosing not to participate, because if you can vote, you're already participating.
There were three real options this past election: MAGA, Dems, and I-don't-care-they're-equally-bad. So yes, not voting when fascists win means you supported fascism.
Obviously that does not mean non-voters are solely to blame. Republicans accepted fascists, those that voted R chose fascists, Dems suck as a party, and non-voters sat back and allowed fascists to take power. On the list, non-voters are the least bad, certainly, but they still bear responsibility.