So what? These whataboutisms add nothing to the conversation.

People aren't going to stop caring about the carbon costs of crypto because other industries also suck. Think about it as an adoption blocker -- if your particular tech fetish can't address an issue that many, many people care about it is destined to be usurped by something that can. Would be awesome if the 'crypto bulls' would expend as much energy into ways to fix the carbon problem as they do arguing it doesn't matter.