You'd have to be blind to not see that the "mainstream system" is the one flushing the climate down the toilet.

Bitcoin is just a byproduct of the "mainstream system". It was created by it. It's like the waste product that comes out when refining toxic ancient sludge into oil. And Bitcoin will never go away until the "main stream system" itself dies.

I’m not (only) talking about things like fractional reserve banking and central banks, but of regular nation states that can collect (and do succeed in collecting) taxes.

Bitcoin can simply be banned. It’s not that complicated. Note that the ban wouldn’t be on the tech itself, mining or possession. It would simply be a ban at the points of contact with the regular economy. Basically you can’t exchange currency, goods or services for BTC.

I am afraid, that replacing the mainstream system may not work without affecting it.

Exactly. Me too. Which is why I’m sure we shouldn’t allow it.

I am not sufficiently convinced of the benefits of the existing system to fight for it, so I am ok with some experiments. Should they really replace the status quo, then only because they have proven to be superior. If not, then probably other experiments are needed, because one thing is obvious to me: the existing system has terrible issues that we should try to solve.