You're right, reading occasional blog posts doesn't do anything for anyone, on pretty much any topic. I'd argue that anyone professing to be a rationalist on those grounds is lying to themselves.

Also worth pointing out that the rationalist community has a lot of issues and biases that mostly spring from focus problems - like any group, they tend to hyper-analyze a few pet issues that draw their attention and then ignore the rest of the world. Even if they're correctly analyzing those issues, the social problem of biased community focus ends up thwarting the goal of overall rationality. I don't think this is a problem specific to rationalists, rather a general failure of human communication (for any -ism, you'll find that people have tunnel vision and tend to force everything they see and hear through the lens of that -ism), but it is rightly criticized more there because the movement claims to be better at seeking truth than others. I have no idea how to solve that problem, it's really an emergent result of what gets people hot and bothered and draws their attention and analysis, which is an innate human irrationality and extremely hard to think your way around.