Personal responsibility, the flip side of liberty, is the principle that each person is responsible for the consequences of the actions that he chose to take, and that others should not be forced to render aid if his actions impact him negatively. This concept has been twisted by some governments that seek to also blame a person for the government's responses to his actions. E.g., people say "Don't do the crime if you can't do the time", as though the person who commits a victimless crime is wrong to blame statists for his incarceration rather than accepting personal responsibility for his fate.
The child liberation movement believes that is the personal responsibility of each child to take care of his own well-being even if he lacks the ability to do so or if no one is available to help him. This is because any other principle would infringe the liberty of other parties to do as they wish with their own resources.