Do some people make bad decisions about degree choice? - Yes
Do some people drop out of school because it's too hard or because of other circumstances (unexpected baby, financial hardship, etc) - Yes
Do those people who either have made bad decisions, had less fortunate circumstances than others, or a combination of both deserve to live under a mountain of debt for the rest of their life? - No
One other thing people don't consider is that Most 18 year olds don't have a good grasp on money or what they want to do in general and in my hometown (poor county in WV) there was a TON of pressure to go to college if you didn't know what you want to do. Kids don't know better to not get into debt for a degree because everyone tells them not to worry about it. There is a serious problem with financial education in the US.
You can help out people who made a bad decision or had bad luck without being so uptight about how everything has to be complete "fair". The world isn't fair from the time we're born till the time we die.