and who exactly is harmed when two people engage in free trade with resources they own? In your example the bank robber does not own the money, it was stolen and the robber has no claim, only possession.
you're using electricity just to comment on this thread - presumably you're okay with that, so what makes your electricity usage justified and not bitcoin owners? Both forms of electricity have been paid for (presumably) with resources you own and traded in good faith. It's not illegal to use electricity to mine crypto in the vast majority of places.
as for altcoins I really don't know what your point is