You're right about a great deal of street violence being alcohol-fuelled and that "random" assualts are often provoked (at least in the mind of the perpetrator) by some action of the victim. Muggers, though, are opportunistic and pick the most vulnerable targets possible. So even if you aren't involved in drugs or gangs, haven't been "disrespectful" to anybody recently and aren't intoxicated, you are still more likely to be a victim of this type of crime if you are alone, lost, frail, elderly, disabled or - most of all - female. I've never been mugged, but then I'm a stocky young male with a shaved head and a sulky expression. I have several female acquaintances who have been mugged (more than once) simply because they were easy targets. They hadn't done anything further to "deserve" it.