With respect, this is a short-sighted take. There’s literally no legitimate crime that is made worse because a person tried to avoid it being detected. Plot a murder over tor? Not a good look. But in what universe is someone less morally culpable because they just posted on craigslist?
On the other hand, allowing the use of encryption or other privacy methods to affect the criminality or punishment assigned to an action just creates a backdoor to criminalizing privacy itself. Allowing that serves no real purpose in deterring folks from hurting others, but it sure does further the interests of an oppressive or authoritarian regime.
Make use of the block function. Lemmy makes it super easy to block assholes and it just makes life more pleasant. In ~2 years, I’ve amassed a block list of 39 users. It turns out that the vast majority of shittiness comes from a very small number of people.