What is the problem here? The banking system uses a lot more electricity, yet people never complained, not even ecologists. Most of the electricity to mine comes from renewable energies. The energy that would otherwise be lost: even if there is no demand, the sun continues to shine, it doesn't care if you need electricity.
This is exactly right. I'm sure most of the arguments are well-worn but I outlined a few in The Currencies That Are Killing Our Planet.
The whole 'high energy consumption' meme regarding bitcoin and crypto is just another attack on BTC similar to and with the same kind of validity as 'but criminals use it'.