[quote=HollywoodMole]
Listing "benefits" to the enslavement of thousands isn't okay...
[/quote]

Well there are benefits to bad and good things that has happened from thousands of years. Like from example, World War 2 got major countries (America, England, etc) out of the Great Depression. It showed that women could work by themselves and how powerful they can be; and it ended discrimination against African Americans and helped the Hispanics out as well. And the USA became a superpower because other countries were beaten down badly; so the US helped them get them back on their feet. 

The Holocaust helped formed Israel from Jewish people and it will help stop future acts of hatred before they can even start. The Black Death helped lower the population, ended feudalism, and jumped start the Renaissance.

Just pick up a history book and read it, you will see bad things have both good and bad outcomes.