The hell it isn't. You haven't got the foggiest clue what Marx wrote do you. Let me guess you read the manifesto and thought you were an edgy contrarian didn't you. Marx wrote a library of works on relational ethics and sociology, as well as economics. If you think he stopped at ownership you have barely scratched the surface. As bad as the capitalists that read Wealth of Nations and didn't bother to read the rest of Smith or the other capitalist thinkers.
I'm skeptical of everyone. They all tell the truth in their own way, and dismissing anyone outright is foolish, but it's important to know their blind spots as well. I was raised in a firehose of lies and half truths. From every side of the argument, the ones I'm most sympathetic to included. I can feel the spin on your take from your take a thousand miles away.