Capitalism has failed everywhere it was tried, it created a class of proletarians dispossessed of natural resources and the means of production and kept them at service of the bourgeoisie by the threat of impoverishment. Poverty doesn’t have to exist, but it must exist under capitalism. Capitalism doesn’t require giving according to need, it requires producing according to profit, and as a result many go without.
It is a bullshit repeated lie that the hegemonic press keeps touting that capitalism has significantly reduced global poverty, and they use numbers dating back to the 1800s. Two problems with this: one, we didn’t collect data on global poverty until 1981 so everything before that is very unreliable; two, the standard for living in extreme poverty is living on less than $1.90 a day. If you raise the standard to something even slightly more reasonable, $7.40, you find that more people have actually been falling into poverty since 1981, and a majority of the world (about 60%) live below this line. Poverty is rising in the capitalist countries, and the biggest reductions in global poverty come from East Asia, that’s right, China. The socialist country that you said was failing.
It’s also bullshit to say that any of the Marxist-Leninist governments have established communism. None of them have, and none of them probably will because it’s very unlikely that the state will actually wither away. Besides, they won’t willingly lower their guard amid hostile trade with capitalist nations, and embargoes and sanctions and so forth.
National socialism has nothing to do with Marxist socialism, as Hitler said himself. Mussolini abandoned class struggle and proletarian dictatorship for class collaboration, turning syndicalism into national syndicalism, advocating for corporate syndicates. Like Hitler, he suppressed and murdered the socialists in his country.