Pope Francis said something to the effect of "capitalism is broken, because the core concept is that there's a pot at the top that fills up (with money) and then it overflows and trickles down to all the pots and cups underneath. Today that pot at the top is bottomless and nothing trickles down"
Well, the pope does not really understand capitalism then. Capitalism is all about owning capital, and using that capital, as Labor = Capital. I guess he never read Adam Smith, which would not surprise me knowing Bergoglio's mindset.
Trickle down theory is a possible component of capitalism, nothing more. Capitalism implies that once you gain your capital though labor, you invest it, to get more capital. That is not only for the Waltons or the Gates, but also for us mere mortals. By investing, you share part of your capital, which is the "trickle down", distributive component. The problem arises when people with little or no capital spend money to buy WWE pay per view for $100 for a single event (or the $5000 superbowl tickets).