In a bit more nuanced view, the pre-war (WW1) and inter-war (WW1 to WW2) both liberal and conservative parties didn't really care about either social or nationa

In a bit more nuanced view, the pre-war (WW1) and inter-war (WW1 to WW2) both liberal and conservative parties didn't really care about either social or nationalist stuff and because of that got nearly wiped out by nationalist and socialist parties. To survive, they had to heavily borrow from both. Which they duly did after WW2 in the spectre of Hitler and Stalin. In an even more nuanced view, Hitler was also supported by many rich people and high taxes and nationalisations served to cut their power. And in most countries, the means of propaganda was also nationalized and/or heavily regulated. So it was about much more than just the poor masses.