Keep in mind that this is a guest opinion, which means it is not intended to reflect the official opinion of the Washington Post—in fact, it might be the opposite, but published anyway in order to provide a diversity of viewpoints. (Personally, I do not like everyone they have chosen to platform, but it is not unreasonable for them to want to err on the side of listening to what the other side has to say to avoid creating an echo chamber.)
Nonsense. The “it’s just opinion” canard is so tired, please just let it die. By publishing an opinion in a well regarded (deservedly or not) news outlet, they launder ideas into mainstream acceptability by announcing that a reasonable person could hold such an opinion. A reasonable person can not hold such an opinion as this. If it was published with a warning and an analysis of how dangerous this is and to make people aware of how the extreme right thinks, that would be one thing. But publishing an opinion without comment is endorsement, no matter how much people say it isn’t.