I want my kids to be able to understand the world they are in, how it came to be that way, and which parts are mutable, which immutable. I want them to be able to recognize truth from falsehood. I want them to want to find out more truths, as well. I want them to be able to communicate well enough to convey their ideas, their opinions, and their knowledge to others. I want them to experience joy.
That means they need to be able to think and reason. All of that means they need to know science, math, history, literature, rhetoric, art, and philosophy, as well as some economics, some engineering and a few other things. That's why I want the liberal arts education.