The answer is (im not working class, though not upper) I don't think socialism as shown itself to be he best way to distribute goods, promote innovation and ensure the best quality of life to the most people. It doesnt believe in private property and is distrustful of family and has shown problems through its history of not turning towards authoritarianism and a repression of dissent. It also runs into problems when you have ethnic, religious, cultural and racial divides that run deeper than class.
Capitalism unfettered clearly has problems with throwing'undeserving' people to the margins, not distributing productivity and economic gains as fairly as is probably warranted and distributing certain goods. But its track record and ability to mesh with democracy and reform while still maintaining a large amount of personal and economic freedom as well as its history of increasing the quality of life for billions is unmatched by another systems yet tried.
I'm firmly in the capitalist camp for the vast majority of the economy
Socialism isn't against private property, fuck, the main tenet of socialism is workers
owning the means of productions. And I don't think it's been proven anywhere that co-ops are categorically less efficient than other models of ownership.
Private property goes away in communism, which is the next stage (going by Marx's stages of history) - but it's a result of a superabundant post scarcity society. The idea there is that in a world with no scarcity, you don't need private property because everyone can get everything that they want. It's not that the government takes your property, not to mention communism is free associating stateless utopian society that doesn't even has governments.
Which is why I always say, if you want to bring communism, you should focus less on politics and more on building a star trek replicator.
p.s.
Though to be fair, the US idolize work so much (well, at least idolizing the idea that other people should work) that the transition to a post scarcity economy (which you can argue we're already pretty much there) is going to be really painful to a lot of people.