That's because they include people in gangs or targeted for domestic abuse, caught up in feuds with others, and such.

There's also the fact that a person in a seedy area with lots of violence going on, might be victim or witness more than a shooting in his lifetime too, even if they're totally innocent and more involved.

But with those factors taken out, it's not like being shot once is connected to being shot again via any other mysterious route...

So, yes, if you were shot once at a drug deal gone wrong, or John Wick tried to killed you and missed at some point, you'll likely be shot again.

If, on the other hand, you were an accidental victim of some random mass shooting, or got caught in a crossfire once and you're not living in some ghetto, it's not like you'll be more likely to be shot again because of it.