Done right, they produce more wealth and some of that wealth goes to society. It's not just that they pay more tax; they also simply produce more wealth, which

Done right, they produce more wealth and some of that wealth goes to society. It's not just that they pay more tax; they also simply produce more wealth, which is not a zero sum game. Over a lifetime, society benefits and the person benefits. Everyone wins. Done right. Stretching the discussion a little, we could ask the same question about all education. Why is any of it free? But the benefits to the United States (for example) of almost everyone being able to read and write (for example) are incredible. If a large proportion of the US population had dropped out of school before being able to read and write (because of the cost), the US would be extraordinarily less wealthy. Everyone would lose out.