Are computer games also a huge negative for society?

With your reasoning, they provide no utility, waste an insane amount of energy, mostly involve violence, etc.

I don't want to live in a country that starts banning things for those reasons.

The utility of cryptocurrencies is not decided by governments, or companies, or you. The utility will be decided by reality. I like living in democracy and capitalism, but it seems you prefer a dictatorships.

The use case of crypto is to purchase things online without the knowledge or permission of your government. How you feel about that probably tells you more about how your feel about your government than anything else.