Why doesn't The Doctor start a revolution? Or has he long ago?

Clara- Doctor, you started something.
The Doctor- Something?
Clara- Don't you remember? peace, love, that was you. you stood out from the crowd. no one listened until.....
The Doctor- Until..... you're right, why? why didn't they listen?
Clara- Because they stopped, stopped listening.
The Doctor- Fair enough, I do go on a little
Clara-So, that something, we got to use that, starting now.
The Doctor- So, let's go, The Doctor has a plan, keep on moving, might get a little exciting.

Clara- And all because the lady loves Milk Tray?
The Doctor- That was long ago, a special favour for a friend that started a revolution.