Subduing a wilful child is not an easy task. 1. wilful = self-willed, headstrong, capricious
They included, abolishing the distinction between murder and wilful murder and doing away with provocation as a partial defense.
2. wilful = premeditated
Yes. They are in fact not so different as they seem.
in #1, the child is determined to follow its own will, regardless of what others think. In #2, the criminal is following his own will, committing the crime deliberately.