IT is apparent that many young people are responsible for causing mayhem, mainly during the night hours. Is it because they are unemployed, or is it becasue they want to draw attention to their hopelessness? Whatever the reason, is it not time to reintroduce National Service as a remedial measure? It need not be service in the armed forces, it could be some equally demanding community activity in an enclosed environment. Peter Castle 2 Holly Bank Church Hill Whitchurch