First, the point that employees are not always shareholders. They get payed to do a job at a wage accepted by both the company and employee.

Second, the idea of socialism over all. As Marx described it, it's merely a transitional phase: the means of production is taken from capitalists and given to the government to basically hold in custody until it can be passed to the people. Don't believe me that this push is happening? Elizabeth Warren wants workers placed on company boards. The fruits are those produced by someone who works, be it for a company or starting his own. I go out and earn money, and socialism says I must give that money away, not to the government to uphold the social contract. Rather, it says I must give it to anyone who does not have a constantly-changing set of "basic needs", simply by virtue of their existence. It's not encouragement to give to charity (which I already do, as I can), but rather coercion by the government.