The Devil is in the details, but sometimes you need to make deal with the Devil to pave the way to righteousness.
I look at history through multiple facets and pick out the nuggets of truth that I can collect and decide paint my pictures of events through that.
Never take one persons perspective at face value, because everybody has their own opinion and paints a picture to how they see it. Make your own opinion. Even though more details about events come up all the time. Even those are not all the details on what happened. Unless you were actually there when decisions were made. No one will ever know the complete full story of anything.
There will always be greed, bigotry in one form or another, superiority complexes, war... We're humans. Its in our nature. Our evolution. You can be a good person and have those qualities. It just depends on how well you can hide it or refuse to act on it, but you still have them.
Also most technological innovations were military projects at first or with the military in mind. Microwave Oven (early radar tests), Velcro, GPS, Computers, Internet, Airplanes... the list goes one.