Observe sudden behavior changes in the younger generation. Talk to them and try to guide them properly.
I think this is one of the major reasons for the societal decadence. A lot of parents would never allow other people caution their children when they find them doing bad things. I remember growing up as a child, if I do something wrong and any elder sees me, he or she will caution me first before even telling my parents. But these days, if a stranger cautions a child, the parents will take it very personal with that stranger. Hence people have now developed a "it's none of my business attitude".