If that was true than many races and civilizations would have been wiped out from all over Africa, Asia and the Mediterranean, if Muslims did massive genocides like you claim than show me one historical account from the 800 AD up to the 1700's where hundreds of thousands of Natives were butchered?, Muslim ruled Spain for over 800 years but those Spanish moors were also wiped out by the European Christians another genocide, Muslim ruled India for over a thousands year, did we wipe out Hindus like you did with the Native Americans?.
You didn't liberate the Arabs, you gave military dictators and warlords who sided with you against the Ottoman Turks with lands as compensation and reward for their "Loyalty", you conquered the middle east and carved it up in a way that would best serve the western interest.
Stopping the slave trade doesn't make you suddenly the good guys after all you were practicing it for hundred of years.
Please let go of this orgasmic bravado you have for yourself, Europeans are responsible for wiping out many races and civilizations, US itself standing on the bones of the Native Americans and a state that has at war for 209 years out of 236 years since its existence, that is a 93% of war while only 7% of peace.