As far as I know, liberalism led to the Great Depression which led to the rise of Keynesianism. Only when the ideas of liberalism became more popular again (during the 70s under Thatcher) they were referred to as _neo_liberal.
Still, i find the idea that capitalism per se is worse than nazism not only wrong but also stupid and insulting to the victims of the Holocaust. This of course does not excuse the exploitation and other crimes comitted in the name of profit maximization!
I think you have a point when you say that capitalism and nazism have similar root causes.
With the other things: whatever. I still rather live in a capitalist system than in a nazi-system and i interpret the meme in a way that it wants to play down the magnitude of evilness of nazism by doubting that its far worse than capitalism.