I think DHH's opinion is a very common sentiment in Europe. "Gypsies" are a very European thing. I wonder if there's anything similar in the US? For context for US readers; they generally exist outside of the usual social norms, and have a pretty bad reputation because of it. This is not a defence of DHH, just providing context to his comments.
His comparison to them as wolf-like predators (and you shoot wolves), previous posts about mass deportation and forced remigration ... no, most Europeans aren't veering strongly into hard-right territory.