"...helped the adoption of renewables and made them cheaper." How so?

Miners are chasing profit margin so they'll use whatever's cheapest. If that's renewable where some of them are, so be it. And if everyone else start reducing use of coal and that becomes cheap, miners who exploits that to derive higher profit margin will grow faster I imagine.

I would attribute growth and economies of scale that renewables have achieved to renewable proponents, industries, government subsidies and loan prorams. Crypto miners are energy consumers and some of them use renewable energy. But how do we go from there to miners being some kind of force for good in this context?

It has helped the adoption of renewables in the same sense how polluting the local river has helped the anti-pollution industry. This is broken window logic. The reason bitcoin uses renwables in the first place is because much of it happens in China where misguided state projects and subsidies have created excess capacity. It makes for a pretty decent joke though, the libertarian currency de jure runs on the misguided state planning of the Communist party of China.

Any excess capacity spent on crypto currency is waste. It could go to scientific computing projects, it could simply not be used. The chips for the equipment (we are in a global chip shortage) could go to something that actually contributes to the real economy.

It may not necessarily be the same as "broken window" logic. Consider a world where no one had ever broken a window. There wouldn't be any window repair people. The first time a window breaks, we have a new opportunity to fill a need. Necessity is the mother of invention. The exponential demand for energy creates more pressure to develop more efficient renewable energy generation methods that probably wouldn't be incentivized by a constant amount of energy use. It's a risky bet, but it might be the only way to spur humanity into action.

We just need to increase carbon taxes at the same rate that renewables become affordable.

it's a complete non-argument you can use it to justify literally anything. Dropping atomic bombs on Japan, hey construction boom! Covid-19, pharma industry innovation! Do you turn the heater on and leave the fridge open to accelerate humanity's fight against climate change? No.

We have about a few thousand pressing issues that spur us on to push for renewables as it is, we don't need to waste energy on purpose.

> We have about a few thousand pressing issues that spur us on to push for renewables as it is, we don't need to waste energy on purpose.

Crypto mining is one of those issues, we don't have a choice. Your argument reduces to "if we had no issues pushing us, we would have enough issues pushing us" which is a contradiction.