But I was not making an argument that Bitcoin is not wasteful.

I was making an argument that deciding what is a valuable human activity does not include wastefulness at all. (OP was implying that someone from the future will value these mining efforts in a regretful way)

People are having fun earning money by burning gas and mining Bitcoin. There are so many other equivalent activities that do not receive any uproar but are even more wasteful.

For example, eating meat is insanely wasteful. Yet you will find people defending it.

Wasting energy is the thing we do for various reasons. The underlying "regret" that someone from the future should have due to it not being productive or useful is completely irrelevant. We rarely do things because they are energy efficient.