There is one person/bot here with well over 30 comments in this comment section making all about race and racism even though the topic is migration. Don't you have any guidelines about that?
I see several pro-mass immigration posters who try to pretend opposition to mass immigration is about racism. Don't think any of them are bots.
Of course we do: https://news.ycombinator.com/newsguidelines.html.
Don't make the mistake of assuming moderator omniscience (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...)! - we don't see most of what gets posted to HN, and we mostly don't read the threads sequentially.