I totally agree with this article about the importance of teaching good manners to children. And not only children: given the current state of affairs, I know a whole lotta people who would benefit from reading it.
At some point, people lost sight of the fact that manners are not some tortured stricture that forces us to act a certain way; manners are the way we show respect for ourselves and for other people. Without respect the world descends into anarchy and chaos. I know you are probably thinking "too late"; but it is never too late to understand the added value brought to our lives by good manners.