This is a truly terrible take. If I run a restaurant, and it goes out of business, I don't get to blame my customers. If I ever want to run a successful restaurant, I have to look at my product, marketing, and service and figure out where I failed. If Biden loses, then the Dems need to look at where they failed; I'd start with the fact that they chose not to hold a primary when the majority of their own party didn't want Biden to be the candidate.
This is a bad analogy. This isn't like running a business. Voters don't have a lot of choice over the product, they just have their vote. We have two choices (effectively) and some will reject a candidate over a single issue when the consequences are much broader.
You're right, it's not a good analogy. In this country, voting is not mandatory, election day isn't a holiday, and in many states, mail-in voting is not available and polling locations are sparse. Voting is a hardship for many Americans, especially lower income Americans. This isn't like asking someone to go to a restaurant; going to a restaurant is easier and has more tangible benefits.
However, my core point is the same. The most basic function of a political party is to get votes and win elections. If the party can't do that, the failure lies with the party, not the voters.
It's as if a town has the choice of having one restaurant and only one restaurant. We have one that meekly attempted to do right by their customers and fell short, or the other that actively tries to harm some of its customers (often your family and friends).
You only have those 2 choices. You can't get a different restaurant. You're forced to eat at the restaurant that is chosen, whether you helped choose it or not. And yes, you can blame the customers because they have literally only this option, and there is no better choice this time.
Let's fix your fixing of my analogy. Imagine the two restaurants you mentioned exist. Now imagine thinking the people who don't go out to eat are entitled.
And yeah, I know you're going to tell me that elections have consequences for everyone, whether they vote or not, but most people who don't vote don't see it that way. Sure, a small percentage of them are withholding their vote as a protest, but most of them are working class people that are barely getting by. They're not going waste what little free time they have voting for a candidate if they don't think it will help them. So stop trying to shame them into voting and give them something to vote for.