Lemmy

I suppose a comment can be deleted or a user can be banned depending on who manages and moderates each community within an instance, apart from the rules (if any) that they establish in each case. It would be a problem of certain communities, which in others does not appear.

In regard to meat eating, I presume that the case would be given in a vegan thematic community, possibly with comments in an unconstructive attitude or out of context.

There can be the case that a community exists as a propagandistic platform in which no debate with discordant positions is allowed. It's probably not the best practice, but there it is. You can also negatively evaluate publications, try to create new post introducing and argumenting your disconformity, or even disagree by not participating or blocking the community.

I think there are other communities that are not like this for now. There is also the option to participate in other instances or to host your own.