Barack Obama: “If somebody was sending rockets into my house where my two daughters sleep at night, I'm going to do everything in my…”

Use that hope to make a difference. Get involved.

I think when we act on that basis, it doesn't always work out, but over time things do get better.

A drift towards extremism was "not inevitable

If I had a blame pie for why politics is so polarised and why we're seeing a rise of populism in many places, it's because of that information that is going into our brains every day.