[Nasrudith]

Rationality also keeps you from getting taken for a ride by failing for every last scam in the book. Productivity doesn't do you any good and probably not society getting siphoned. And that is before getting roped into doing harm to others intentionally or otherwise.

Personally I disagree with the mutual affinity incompatibility. If rationality is getting in the way it is for a reason - if you both like rowing and musical theater there is nothing to object to but if they are also say a serial killer to give a deliberately extreme example....