That’s like being arrested for jaywalking for thinking about the time your cousin got arrested for jaywalking…
As neuroscientist Lisa Feldman Barrett will tell you, the fact that they mistook his walking stick for a gun can be explained.
Once he had shown that it was a walking stick, they should have apologized and left the man in peace.
Is it the adrenaline high that causes police officers to do such daft things? That too would be understandable, but then they should develop the habit of going for a jog around the block after each such instance.