If muslims were forced to compensate for every killing they have done for the last 1400 years, there won't be a single muslim left on earth. Every strand of hair, every teeth and blood will be used to repay the world for their ignorance, bigotry, racism, slavery, and genocide.
The United States of America was created after exterminating the native American Indians who lived there for many thousands of years before the arrival of the Europeans. Christian missionaries played a large role in the extermination, and people such as the "blessed" Junípero Serra single handedly wiped out entire ethnic groups (such as the Tongva). Does that mean that some one should kill all the Christians using whatever means available?