If indeed there are people who see atheism as fundamentally disconnected from general-purpose rationalism, or who don't see the promotion of atheism as a mere corollary of the promotion of a general rationalist worldview, or who object to making the atheist movement about rationality and science rather than mere disbelief in god, then I do think those people are wrong.

The problem is that's not what Myers was trying to do with Atheism Plus. The values he wanted to introduce were those of the "social justice" crowd, a.k.a., the people who believe that certain scientific opinions are inherently "unjust" and shouldn't be heard, that their cause is so noble that it justifies lying and falsifying science.