Kochs aren't worried about capitalism which is a system of exchange. They are worried about not being able to their own profits in the short term. As extractive industries they want to buy protection from other advocates with environmental views by starving them out of the discussion! Here's the problem. Capitalism (market economies) only works if there is a fair balance of power among the buyers and the sellers. That other thing that the Kochs are protecting is oligarchy--rule by the wealthy.