Depends on what things are being labeled as suspicious activity. Just playing devil's advocate (mostly) but maybe it would be nice if individual citizens would be more proactive in crime prevention. With all respect to LEOs, they are by nature a reactive force and there are far too few of them to be everywhere at once.
That would be great, but in today's society and our b.s. legal system, you'll get in trouble (most of the time) if you try to prevent a crime. Do like they tell you, and be good little wittness' giving good reports.