There are many more reasons I could provide, but these are a good start.
1. The opposite of wisdom is confusion, error, foolishness, and ignorance. Who wants to have any of those words to describe how we live?
2. The Bible has strong statements on wrong teaching. It calls it false teaching. The Old Testament prophets referred to false or lying prophets. Error is always a bad thing, but when error is about essential Christian beliefs, it is deadly.
3. Today knowledge about God, Jesus, the Bible, basic Christian beliefs, and Christian ethics is in short supply. With all the resources we have available, we just do not take the time to read, study, think, reflect, and discern truth. We are easily susceptible to wrong teaching that a generation ago would have been quickly identified as wrong teaching.
4. Along with truth being in short supply, many followers of Jesus have a hybrid Christian mindset,. or what is sometimes called syncretism. This is when a truth of the Bible is so intertwined with a cultural belief that the cultural belief changes the biblical truth. The classic example today is the "prosperity" teaching. It is the American dream of health and wealth that is given a biblical paint job and labeled as God's will for you. You should never suffer, never be sick, never struggle financially. If you do, you are lacking faith. That's so far from the Bible, it is embarrassing.
5. Wrong ideas inevitably lead to bad choices, and those choices lead to behaviors. When behaviors are sustained, they turn into habits and a lifestyle. If there is a "lie" that is now so dominant and pervasive, and so powerful in its effects, it is this:
You are the Center of Life. Everything revolves around you. You decide what is good and true for you. No one else can tell you you are wrong. Do whatever it takes to get things the way you want. Follow your gut. Add to this lie, another one, that life is about money and possessions and you should devote yourself to accumulating as much as you can, and you have the recipe for making terrible choices. Like going into incredible debt that makes life a burden.
When we learn the error of our ways, we can begin to make wiser decisions, but the consequences of wrong thinking can linger for decades.
6. The Apostle Paul says the days can be evil. Therefore, we must be careful how we live, not as unwise, but as wise people, who are not foolish but who know the will of God (Ephesians 5:15-17). Earlier in this letter he also talked about the futility of thinking, darkened understanding, ignorance, and hardened hearts, all because we are separated from God (Ephesians 4:17-18).