Note: I am aware that they can blacklist bitcoins and trace them nearly perfect nowadays, which can make them somewhat useless even if you still own them. With Monero, this is made far more difficult.
Consider jews fleeing Nazi Germany. Should they have been allowed to escape with their assets? Would the world be a better place had they been able to?
Your argument that crypto is consuming too much opportunity cost is completely valid.
But why fight against something that offers hope for the misfortunate?
But I ask you an analogous question: what do you say to the people suffering any crime that was aided by free, encrypted communications on the internet?
I'm not using this as a fool-proof argument that the utility of crypto is positive. I do not know the true answer. I think it's positive but I acknowledge it very well could be negative.
To me, blockchains enable the basic human right of having ultimate authority over your own assets. You can choose whether attempting to circumvent your government is worth it. In most cases, it's not. But I like giving all human beings that option.
The right to have authority over your financial assets is just not that interesting to me. I'm largely ambivalent about people's right to hold private property (capital), if anything I oppose it. I care more about people's rights to hold personal property, like their home and the other tools they need to survive, but crypto cannot do anything to protect that because you can't put it into the blockchain.
I'm not a big lover of state power, but I have no interest in supporting the wealthy in thwarting state power. My view is that that is how cryptoassets after used in practice; as speculative assets, which is largely a shell game that transfers more wealth to the wealthy, and as a means to evade taxes, capital controls, and law enforcement.
I believe the main place we differ is that you seem to think these are necessary evils and that crypto will change for the better, and I'm pretty sure this is crypto is telling us what it is about and what it is for, and that we should listen & believe it. I think building a better society requires changing social relations by confronting them and discussing them, not by somehow transcending then through technology. Cryptoassets propose to "solve" trust by abstracting away humans and relationships, but that's just the wrong direction; trust is formed by speaking to and connecting directly with each other, not through math. In the same way locks may keep people honest but don't really stop dishonest people who are determined to gain entry.
I mean, context. That's what the Nazis rose to power on: giving hope to a people that felt robbed after WWI. Just because a person or a technology offers hope doesn't mean it can deliver.