Education is not the be all and end all of having a happy life. I have spent a lot of time working with children in my school's Special Education Needs Department. Every day, I see and work with children with a plethora of difficulties both on and off the autistic spectrum, physical and mental. I know for a fact that many of them would not stand a chance with higher education, but yet they are some of the happiest people I know - they are grateful for what they do have, rather than wanting for what they do not. Going to university and/or achieving academic success are two things upon which they have not set their focus, because they know it is not for them.
And that's okay. They couldn't care less, because they couldn't care less about going to university - the whole concept holds no value to them.
If anyone's parents 'force' them into higher education against their will they should try to explain why they don't want to do that, and then refuse. Pretty much every applicant into university is over 18, and as a result would have the full weight of the law behind them in making that decision. Furthermore, universities want candidates who are genuinely motivated to study the course for which they are applying, and will probably therefore render the application of such an applicant unsuccessful.
The world in which we live operates economically. Money is what drives our society, and it creates a self-fulfilling prophecy; money becomes required for essentials such as food and money then becomes essential. It's all very noble to propose to teach others for free, but one has to wonder how you would feed yourself, or where you would live. Could you not be more successful and help more people if you were to utilise money? Think Bill Gates: through becoming the richest person alive, he has been able to do a huge amount of good in the world. Sometimes you have to be selfish before you can be selfless!