The nature of violence has not changed. The class warfare you speak of has existed since the dawn of man. It just has been brought to the forefront of our issue

The nature of violence has not changed. The class warfare you speak of has existed since the dawn of man. It just has been brought to the forefront of our issues now because there are no longer evil tyrants skinning people alive (outside of North Korea). To say otherwise is incredibly ignorant of history. You could take Ancient Rome, for example, as a place where class warfare was entrenched and a major force of change. Marx, of course, thought of the same kind of struggle. People try to portray the Nazis as the cartoonishly evil to explain what they did to the Jewish people but they forget that the 1920s-30s was a ruinous time for everyone except the mostly Jewish banker class who were able to transfer their currency out of the German marks before the hyperinflation. You had a situation where Jewish families were traveling around in carriages while people on the streets were starving to death. Conspiracy theories sprouted up. The National Socialist party (Nazis) were supposed to remedy such differences of wealth, and they did it in the most destructive way possible. The atrocities during the WWII were largely due to class warfare taken to an extreme level. That's why I think you should be very weary when you refer to the situation that presents itself now as "war". Most of violence in history has been moralistic violence, don't fall for it. In any case, no, the nature of violence has not changed, though the costs have increased, which is for the better.