It is impossible to dispute the fact that children are foolish. Its easily proven in all areas of the world. Anyone can fool a child because of their "lack of" knowing a lot of things. So they are not wise.
That said. For the sake of argument, we can state that a child is a fool. Now, since a fool is someone who can easily be misled, they are likely to be drawn towards foolish things. So if you want to recognize the things in this world that are likely unhealthy and/or bad, then just look to the children. The exception of course would be children that are protected by wise parents. But many children are not because they have foolish parents. And those foolish parents will mislead children. This is often seen in the form of popular culture. It is filled with garbage designed to embrace and nurture the foolishness of people for the sake of maximizing monetary profit. Why would it be necessary to associate the foolishness of people with popular culture for profit?
This can be understood just by understanding the most basic example of deception the world has ever known. The story of Adam and Eve. Eve was tempted and deceived to eat the forbidden fruit. Satan represents a deceiver. The meaning of this story is that the tree symbolizes knowledge that Man was never meant to know. Only GOD could carry that knowledge because of His infinite wisdom. The deceiver knew that Eve could not carry that information. It wasn't just about getting into trouble with GOD. It was about promoting corruption. Eve was deceived. But because she was warned, and then ignored the warning, she suffered the consequences of her actions. Same for Adam. Adam and Eve were both fools because of their "lack of" knowing. But the story proves one important point. That faithful obedience of someone else's wisdom is far better than being ignorant just to follow your own inner perceptions based on your own foolish ways. This goes along with the concept of giving up our own Will to follow GOD's. A fundamental concept of Christianity that Christ demonstrated over and over.
Regardless of the time period in our world, people are always the same. It doesn't matter how they dress or act. It doesn't matter how often the fashion of society changes. Nothing is truly different. People are still selfish, living their lives day to day to fullfill their own desires. They still overlook a homeless person the same as they did thousands of years ago. GOD told us this is the Truth. And we can look to the world to see it proven every day. The same hold true for anything else taught about people in the Bible.
When a human life is conceived in the womb, it is of pure heavenly innocence. It becomes less pure as it grows. Still innocent nevertheless. A child is not held accountable by GOD. But a time will come when a child grows into a adult to carry all the crutches and burdens of this world. We become a liability to GOD. So it is very important that we know what is expected from GOD throughout our life. And we must begin to know soon after birth. Remember, a child is a fool. And it requires a wise person to raise a fool into a wise adult. A fool cannot raise a fool to be wise. But...a wise parent's child can become a foolish adult. It happens every day when they send their child to public school. Or, any situation where a child is exposed to foolish popular culture. It is deemed as corruption and should be shunned by parents. A child needs to know the truth about the world. But only on an "as needed" basis. In other words, don't teach a 5 year old about sex. The less a child knows about things, the less they are misled or drawn towards corruption. Feed their brains good things, regardless of what the rest of the world is doing. They can know some dirty truths in their minds. But in practice, they should be walking a good walk in life. Because if you raise a child in the way they should go, that is the way they will always go. And so will their own children.