Kids nowadays are growing up without much discipline in the home and that is a major cause of their misbehaving in school and in society. Why do you think we have so many criminal offenders in their teens and early 20s?
Juvenile delinquency has actually gone down considerably since the early '90s. Furthermore attributing it to 'kids' implies that it's not gender specific. That's demonstrably false, it's mostly young men committing crime - especially violent ones. The truth is that America has serious issues with the 'roles' and expectations placed on young men and women in our culture. Unless it addresses that, we're going to see men acting in increasingly dysfunctional and immature ways.
Now with that said I don't think corporal punishment really has anything to do with that, although I think it would provide a reasonable deterrent and/or form of social control in some cases.