By all means name the schools and headmasters. They are responsible too.
But the parents have greater responsibility. They had the child for 16 to 20 years, fulltime and exclusively. The headmasters? At most 6 years, probably less and with hundreds of other children to monitor too. If all the kids from one school became gangsters, then put the headmaster of that school in jail.
When the child turns out really bad due to negative internal family reasons, no amount of positive external influence can help. But when a child becomes bad due to negative external influences, positive family influences will negate most of the problems.