Agreed these otherwise great criticisms of social media seem to always fall into this trap. Turning this into a partisan issue is going to backfire, I promise you that. Make this about a political party and it is going to be all too easy to divide people on this issue.
Right now the left and the right are aligned in their loathing of Facebook -- but every time the message "Facebook helped Trump get elected because his supporters are racists and easily manipulated" is parrotted it serves to encourage them to take the opposing side to defend themselves and claim Facebook's tactics are being overblown. They'll never defend Zuck, but they will fight against clamping down on tech companies in the name of defending capitalism and American jobs (and, without saying so, as a way to assert they were not manipulated and resent being called racists.)