As long as we seek to enable very broad values we can agree. It is blatantly obvious that with increasing specificity of goals, increasing sectarianism, dissent, and the spectre of force inevitably rears it's ugly head. We can work together to enable freedom, but we are not all going to work together to enable freedom to consume what we choose, or to publish the speech we choose. Even at this extremely broad level of detail violent opposition arises, and instead of working together to achieve those things, we will devolve into violent opposition.
At least, this is what I see in the annals of history, as impacted by populist leaders, politicians, and powerful overlords.
The annals of history are relevant in this respect if we use the same methods used at that time, i think (as well as being relevant so we know what not to do).
We'll be using the same people, and that's the real issue.