If we start talking about terrible things done by collectively or state owner endeavors we find things just as terrible like the holomdor, the 5 Year Leap. I mean don't get me wrong Apple is doing some seriously terrible things with their power grabs and monopolies, but I don't know if equates to 5 million dead of famine in 5 years, and although Google is violating my privacy and sucking up everyone's data I would prefer that over being loaded on a train to a concentration camp.
My point isn't to exonerate capitalism, because Nestle is a truly despicable company and have committed crimes of close to the same magnitude, but to believe that just changing the system is going to magically make everything better is in my opinion naive, because no matter how great you try and make your system if you fill it entirely with bad people it will result in bad outcomes.
Additionally we often find that during times of large scale change in "systems" it is more often than not the most ruthless, sociopathic, despotic individuals rise to the top because they are most willing to do whatever it takes to retain power. In contrast it seems like the activist investors that amass capital and attempt to force changes in company through monetary means is much less disruptive for the vast majority of people's lives.
EDIT: For some line breaks and missing word.