I'm sorry but I have a real issue with this characterisation.. On a number of levels .
How can you say he went around teaching misguided Muslims the truth? He may have and I believe that he did elucidate and articulate essential truths but I don't believe he went about with a messiah complex trying to save people. Nor do I see any evidence that substantiates that type of reading . I think he was steadfast in a expanding his experience, verifying and challenging his own philosophical beliefs which he had distilled into what I personally consider the most profound, perfectly constructed, concise expression of 'Everything'. Namely , Mool mantar.. I fundamentally disagree with the idea that 'he' (and you seem to conflate guru nanak the person and a conception of the divine) puts us where we deserve to be.. Because that contradicts nirbhau, nirvair.. Guru Nanaks articulations tell us we have control over a great many things in our life and provides us with anecdotes and really very simple examples of how we can if we choose to shed falsehoods.. But it is us who are the agents not him or the divine and definitely not some 'God'.
I disagree that it is beyond logic.. If anything bani is very logical.. The logic is that we must constantly, move and seek, to live as Sikhs as disciples and students. Because we can always do more.. We should never put our hands up and say we have arrived there is nothing more to do. Because if that was the case we wouldn't be living, we could withdraw from society and live in a cave. But as long as we see falsehood we must engage and find solutions whilst not compromising.. A tall order but a ideal, which if we truly believe in bani we must do