Boris Johnson incited a violent mob. Even loyal Tories must now realise he has to go | Chris Bryant

Protesters targeting Keir Starmer yesterday cited foul slurs hurled by the PM. It is clearer than ever that Johnson is unfit for office

Words matter. They are all you have as a politician. They are your only weapon. We wage war and we broker peace with words. We inflame or we calm. That is why it is so important to deploy them carefully and responsibly.

Unfortunately, a cynic knows how to cast aspersions, make an insinuation and whisper sweet nastiness in the public ear - preferably without anyone noticing. But it's a dangerous business. The poison you pour in the well may be intended for your enemy, but it can all too easily poison your friends and all around you too.