What if kids dont know they are illegally downloading songs?

It does not matter if someone does not know that a certain act is illegal or not. Ignorance of the law is not an adequate defense when you get caught.

Besides, it seems unlikely that someone would illegally download a song without knowing it was illegal to do so. Terms of Service notices are usually clear on the issue. Copyright law is also very clear. And kids these day are very computer savvy, and it seems unlikely that they would not know that downloading songs might be illegal.

Even if someone gets caught and claims they did not see any notice to the effect that downloading songs might be illegal, it is highly probable, in this high tech society, that it can be proved that the accused actually did browse to the page that said it was illegal - servers keep very, very good records of their transactions.