Why should people mind their business?

A child was murdered. There's lots of questions that should be asked. How was he lured into an alley late at night? Where was his mom at? What kind of father did he have?
How likely is it that these were good parents?
Seriously, ignoring this and saying to mind your own business is how all this madness continues. People need to be held responsible. Morally responsible.

Where's the good mothers and fathers at in Chicago?