Not only do 'good ideas not need force' they also don't need everyone's approval. This is the fundamental problem with all forms of collectivism. They are predicated on the belief that there is an optimal solution to all problems.
But, there aren't. What works for you may not necessarily work for me. It is this need to control other people's responses to their desired outcomes that informs all of their arguments.
And because they can't see a solution to a problem that must mean one doesn't exist. It is a philosophy built on hubris and intolerance.
Worse, you can lead them, tangentially, to proper conclusions... talk about how neural networks are more fault-tolerant than command-and-control systems with single nodes of failure... but, that isn't good enough for them.
They'll always say, but, "humans are different." Like we're freaking aliens or something. Again, it gets back to control. If they can't control it then it's too scary for them to advocate.
The best metaphor for the voluntarist/anarchic system of problem solving is to....
Let a thousand flowers bloom!
and then step back and accept, humbly, that there are problems in this world we can't all solve. In fact, just by considering the problem we contribute to its solution in the long run as it passes from one person to the next.
Humility, not hubris, will create the world the communists want to live in. That's our job.