There are varying degrees of capitalism, right? If someone thinks it's unfair that his boss earns 100% more than him, then maybe 50, or 25% or even 10% would be fair? Trying to flip an imperfect system upside down doesn't seem right to me.

Modern Western economies generally incorporate a mixture of capitalist and socialist principles. On one hand we have private ownership and capital accumulation, on the other we have universal healthcare, free education, some form of welfare, etc... . You could argue that this is simply "regulated capitalism" but I think it's more accurate to see it as a balance of distinct economic ideals.

My original post was in response to your statement "ideas that don't work in real life". Excepting the fact that anarchist principles are functioning tolerably well in some places such as Rojava; I believe we ought to continually ask ourselves whether the capitalistic appeal to greed and competition is relevant as our social structures and technology evolves. The fact that left-wing revolutions led to authoritarian rule in Russia, China and other countries doesn't refute that we can eventually rid ourselves of that blight.