That much is obvious; what I'm trying to understand is why you don't think there's a strong enough justification to do that.
There already exists market-based incentives for people to go to college when it is in their economic interest to do so.
You've misunderstood; my take is that, as it stands, a lot of people who would pursue highly productive majors/careers make the decision not to go to college because tuition costs are high, a decision that is irrational from a simple economic perspective.
So rather than having people make their own decisions as to whether or not going to college and taking a particular course of study makes economic sense, you want to remove economic considerations entirely and just make it free for everyone....
Kind of the classic paternalism versus individualism dispute, isn't it? People are too dumb to make rational decisions regarding their own lives, so the government has to step in....
Under a market system, people have the opportunity to look into the basic economic facts about prospective careers/majors, and balance for themselves whether or not the cost is worth it. We give people the chance to make rational decisions about their own future.
To the extent people are irrational, you'd expect just as many to irrationally
attend college as would irrationally not
attend college. In either case, though, the burden of making an irrational decision will be born by the person who made it, not by taxpayers. I personally think that's how it should be.
In your "free college" situation, you are removing a huge part of the underlying economic calculus regarding the decision to attend college, and which career path to follow. So not only are you going to have the same number of irrational people making decisions, b
ut you are in fact going to be steering economically rational people to make decisions that are economically irrational in a macro sense.
A person who might
rationally decide that the combined costs of college and not being in the work force exceed the benefits of a degree, may decide that
free college changes their individual calculus, and so decides to attend. From their perspective, that decision makes sense because they no longer have to pay for college. But from the perspective of the taxpayers picking up the tab, that decision doesn't make economic sense. Separating costs from benefits is a sure way to encourage distorted decision-making.