It has enabled an entire online commerce in illegal narcotics.

I mean...., the only use case I think of, is probably monero or de-regulation.

I mean, I am no crypto bro. But Monero is definitely an up for privacy as a privacy enthusiast.

It's pretty useful for committing crimes, I guess?

Committing crimes can be useful for humanity. Wherever you live, or come from, I can almost guarantee the current regime in your country was the result of treason, revolution or usurpation. It’s also quite likely that this event was a net positive for your country. Every single rebel, revolutionary and freedom fighter is someone elses criminal and terrorist.