Surely to be crazy as you've so eloquently put it would require one to posses living brain cells and seeing as Tawney has dead for decades I don't see how he can be Mentally ill. Alas, someone who asks if a well known Socialist is 'crazy' is clearly illustrating his own opposition to such views and thus through your own inability to communicate your rationale you revert to being offensive. Surely then it has to be asked what you've done of such importance that you can denigrate a famous academic without actually putting forward a thoughtful antithesis.
I for example can't stand the works of Peter Kropotkin and fail to empathize with a lot of his writings. I don't however go onto a politics forum and ask if hes 'crazy' or belittle someone who was quite clearly of impeccable intelligence. If I dislike the thoughts or opinions of someone I present my argument and argue my case.