Your continued attempts to associate Sanders with a definition of "socialism" that is basically tantamount to communism are off-base. He favors a capitalist market economy with higher taxation and public spending, just like most Democrats, only to a greater extent.
This is as silly as Democrats calling Trump a Nazi. I don't like Trump, but he's just not.
Now, I don't favor all of Sanders' policies -- I think his blanket student debt cancellation proposal is absurd -- but I do like others. Like his aggressive healthcare reform plan that would put us in line with other Western countries which have figured out how to deliver modern healthcare to the vast majority or all citizens without devoting 20% of GDP to it.
The views of young people on communism are interesting to consider, but I don't consider it a threat. Most of them will grow out of it when they get jobs, homes, and families.
And if the young people are *not* getting jobs (or well-paying ones), and if they're continually priced out of homes such that they are stuck renting forever, and if they don't feel financially secure enough to start families: then maybe we should make the economy work better for young people.
Or else they will continue to support candidates like Sanders, or maybe even farther left than him in the future.
FDR understood this perfectly back in the '30s, back when communism was a much greater threat than today: We have to keep the American dream alive for everyone.