the time that Guru Nanakdevji came to earth was very different to this day. I have been reading a lot to try and learn the circumstances in which the hukam was given that he come to mankind
Its interesting to note that the real oppression and atrociites on India were committed before the Mughals even came on the scene like Mahmud Ghaznavi and Mohammed Ghori - they killed people in the tens of thousands and according to their own biogrophers tried to convert all the Hindus and Buddhist and the rest - this was the time that a large section of Punjab especially western Punjab became Muslim behind the Muslim armies came people like Baba Farid.
They certainly had an agenda for conversion - Punjab was also Buddhist - look at Taxila and they were all almost killed - we had a large population of Jains who did not survive - the Hindus then began to fight back with the rise of the Rajput clans and the kingdom of Vijaynagara in the south;
- according to some traditaions India was really bloodsoaked in violence in this time -
the same time saw the rise of the Bhagats to try and heal the wounds of the people
into this time strode Guru Nanakdevji as a vision for all mankind amongst all the violence and hatred and bickering between Hindus and Muslims