[Tarsul]

the argument went from

BTC is inefficient (OP) to

why did Elon buy (you) to

understanding the difference between rich and ethical (last comment) to

rich investors being wise or not (you again)

To make it short: Just because Elon or rich investors buy doesn't mean they are unwise (for themselves) just that it's bad for the world (ecologically), so basically both can be true. Just the difference between thinking about themselves and thinking about other people as well...