Hindus would have not been now in India if Sikhes also would have forgiven muslims. Hindus have forgot the days when Auranjaeb decided to massly convert the Hindus into muslims by taking out lacs of Janeou(the sacred thread) in a specified weight everyday. THen Hindus requested Sikhes to protect them. 9th Guru, Guru Taeg Bahadur sacrified his life for hindus.
Now today these people talk of forgiveness of Hinduism. Hindus are one of the most selfish communities ever existed on this earth.