I'm not sure the common cause is rationality as much as it is (trans)humanism. There are many traits that readers of this blog tend to share, and rationality certainly isn't the only one. I'm the same way, and while I think rationality may be part of the cause, I suspect the larger cause is my humanist tenancies. I'm also rule utilitarian about lying, so there's that.

And of course one could argue that the distal cause of the humanism/utilitarianism is rationality, but let's not go there.