Don’t tell me this is impossible, nonprofits already exist, using just this logic!

Socialists always assume that entrepreneurship is an inclination and not a combination of talent and skill. Just "wanting" isn't enough. Organizational skill is necessary, and it is surprisingly rare. In the real world, incentives are necessary to bring it out in a big way. Ideologues can create the occasional co-op, but a full-scale economy runs on risk and reward.

The truth does not get tired. The rebuttal to "Socialism has failed everywhere it's been tried" should be a counterexample, but yours isn't. Instead, you "rebut" the claim that socialism has failed everywhere with the fact that capitalism has failed somewhere. I'll let readers decide whether you have made the point.