Well, I think that it depends on the kind problem that is being addressed. Some problems require group choices between incompatible alternatives. Which side of the road to drive on, at least for crowded roads, is a simple example for which I don’t think a completely libertarian method would work. Maybe you can argue otherwise. Another example is how to select a national leader to whom to delegate power to make some group decisions.

Another kind of problem is one that requires coordinated group effort to solve — such as reducing our global human impact on our climate. I doubt that libertarian methods are even close to adequate to solve such problems.

And libertarian waste disposal is notoriously inadequate to deal with harmful effects of toxic waste. Individuals and companies that produce such wastes have long been known to dump their wastes irresponsibly on other people, unless they are constrained from doing so by enforceable laws.

“Group force” is a misleading way to describe some of the concessions that we all have to make to enable our living with other people, such as agreeing about such simple things as our traffic laws and laws requiring responsible waste disposal, or collecting taxes to pay for shared public facilities like parks, schools, and community centers.