But capitalism *is* the problem: current cronyism/corporatism/fascism seems to be an unavoidable outcome of capitalism
Why? Because you say so? Or because you've seen it *sometimes* happen? I can certainly see that it's happened, but claiming it's an "unavoidable outcome" is simply an assertion without support. In fact, it seems to be a false one, since capitalistic markets have existing in many places throughout history without those issues surfacing.
just as tiranny seems to be an unavoidable outcome of comunism.
Communism doesn't necessarily require an oppressive authority, that's just how it's usually implemented. In small groups, it works very well without a powerful leadership involved, but in large groups it becomes difficult to enforce the required contributions because of the complexity of the matrices of so many relationships. Communism should not require exchanging of tokens for resources, but "Communist" governments never seem to be able to eliminate it.
Maybe your "pure" capitalism is free of those problems, but then comunism is also problem-free... in theory.
Nothing is free of problems when it involves humans. Free market capitalism, however, has the best historical track record for improving living conditions. The biggest problem with it in the US today, IMHO, is the ability to buy and sell representatives and administrators. These people are not supposed be commodities, they are supposed to regulate the markets just enough to maintain a competitive environment in which consumers retain power over the producers. I don't think there is an easy answer to that problem, especially with such a large proportion of the population uninvolved and susceptible to marketing.