I think Twitter is OK with drugs and adult content being trendy, but not OK with politically incorrect ones. There has to be a manual approval process, but effectively invisible, because in my opinion, an automated and non-supervised system for trending is a recipe for the disaster.
Please don't break the site guidelines like this. If you have evidence of abuse, you should let us know at hn@ycombinator.com so we can investigate. If you have no specific evidence, then posts like this are not allowed. See https://news.ycombinator.com/newsguidelines.html.
Twitter is a publisher. They have their fingers on the scale in both directions in multiple places.