Medellín's transformation isn't the standard story of better policing and security, working to isolate dangerous individuals. At its core, it represents a fundamental partnership between local authorities and the communities they serve and represent.
The Mexican authorities and the United States drug enforcement agencies are struggling to even remotely control the trafficking of drugs across Mexico's borders. Like a multinational company it is driven by the market. For now the demand is high. So the supply keeps coming...
It is one thing for some of the world's leaders to march for freedom of expression. Well done that they did so, even if some of them were being more than a little hypocritical. But freedom of expression should be used to help build a more just and fair world. Let millions march for that too.
If we strive to change mindsets, promote ambition and invest in young people then we would not need to tell them to put the knives and guns down, they would be in a position to make the right choices. This is not the time to give up or to remain silent.
Picture a courtroom in South London. A young man is in the witness box. He is casually dressed, expressing trendy disregard for courtroom niceties. All of a sudden, he valiantly demolishes the fourth wall by leaving the box in the middle of his testimony.