When I was at university, a thousand years ago, we were encouraged to read widely. This included primary texts from leaders of the IRA, right wing and fascist organisations, the IMF and World Bank, Central American dictators. All sorts. Because perspective is important. Understanding other people is important.
Is it not important to know things anymore, even if you don't agree with them? I cannot fathom the idea that we should all read and follow within a tiny bubble. How does anyone learn or challenge anything.
As a historian I think MB probably knows that.