Slave Labor is free. Slaves don't get to own property. Is that your idea of a profitable benefit?
In the USA the wealth of the south was built on a slave based economy. Much like the Nazi's, they could not have accumulated nearly as much wealth if they had actually had to PAY their workers.
The Nazis, however, had one up on the American slave owners. The people that the Nazi's imprisoned, tortured and murdered were often wealthy property and business owners. Everything owned by the millions of people murdered became the property of the Nazi regime. When I say everything I mean all of their possessions, houses, businesses, bank accounts and even their fillings, eyeglasses and shoes!
As for the other people in the multiple countries that participated in these exterminations, they happily turned a blind eye to the atrocities being committed around them in exchange for the Nazi's promises of prosperity and national pride.
There is NOTHING "right" about the "insult", murder or torture of ANY human beings. To this day many people of Germany are ashamed of the legacy of mass murder left for them by Hitler and their own ancestors.
My greatest source of information on this subject has been my own family. They were wealthy Jews residing in Vienna and running the largest furniture manufacturer in the country. While my Grandfather and his brother escaped with their lives, that is ALL they escaped with. Their parents were captured and murdered and ALL of their property and businesses (which employed members of the Nazi party!) became the property of the Nazis and was never recovered by my family despite numerous attempts after the war. It is my hope that by answering questions here and elsewhere I will be able to educate people like yourself who may have formed opinions on the subject without adequate facts. There is NO justification EVER for the extermination of even a single human being much less over 6 million of them.