premise: To do so requires looking beyond the legislation and the criminal justice system at ways available to our society to deal with problems such as child poverty and child abuse, which are often an underlying cause of youth crime, and to help young people not to make the kind of choices that may lead them to engage in criminal behaviour.
hypothesis: All youth crime is vandalism.
reason: From the context, we do not know specifically what criminal behaviour constitutes youth crime, it could be all, none, or some in regards to vandalism.  Therefore, the statement is neither definitely correct nor definitely incorrect.