Chavrutas might provide extra incentive to rationalize but for some people, especially many lesswrongers, this will be outweighed by having an extra guard against rationalization.

I'm somewhat skeptical that LessWrong readers are so good at avoiding rationalization that we can engage in activities like this without any adverse cognitive effects. It's not like non-LWers are running Windows ME and we are running LINUX--we all share a similar cognitive architecture, and we are all prone to rationalization. Being aware of this fact is not enough to prevent it, just like seeing an optical illusion does not make it go away. It takes a conscious effort to think rationally, and I think we should be focusing our efforts on developing epistemic rigor rather than engaging in something potentially poisonous.

Furthermore, while having a partner in a calm, reasoned discussion will help you catch yourself in the act of rationalizing, having a partner whose purpose is to argue with you probably won't.