Oh yes, I've just seen the Radio Times. Hitler must be one of the other most common targets of conspiracy theorists. I'm not about to say "Pity Hitler" though! (although I might say "Pity the academic historians").
I think the Templars, though, were decent enough chaps (by the standards of their time), more sensible, level-headed and despite being - or, ironically, perhaps because they were - professional crusaders, much more tolerant of the 'other team' than most who took the cross. Mind you, that only further got them into trouble with the conspiracy theorists...