The energy isn't wasted - it is being used to secure the network, which is a very useful application. I could just as equally argue that the energy used to allow people to watch reality TV is completely wasted, not to mention being a net negative for society, but I don't get to dictate how other people use energy that they are purchasing on a free and open market. Energy has a price. If you are willing to pay that price, you get to use that energy. Simple.

I don't disagree, but bitcoin mining is hardly on the same scale as open war with Russia. I'm sure I read in the last few months that some UK politicians were talking about making the UK attractive for cryptocurrency businesses, which is in stark contrast to the horrendous bills and laws currently making their way through the US government.