Out for a walk with the family when we have to stop and turn around because up ahead our path is blocked by someone staggering around and acting erratically. This has happened to me ... 1000 times in adulthood? A quotidian outing sidelined by an antisocial, lurching tweaker monopolizing a public space using the implicit threat of violence? Calling emergency services does nothing. Attempt to intervene and there's always a good chance you're lying dead on the street, with your killer given time served. Most of us are able to compartmentalize or ignore it. But it's easy to become utterly blind with rage that we're expected to live like this.