I don't believe in the concept of hate crimes. I don't care why you commit a crime; if you do the crime, you do the time. I'll accept some circumstances in extenuation or mitigation, but I can't see increasing a penalty because of what a person thought. The crime itself is what merits the punishment. Having "bad thoughts" shouldn't increase the punishment, as the crime itself is what merits the punishment!
I would prosecute this under whatever assault (battery? deadly weapon, perhaps?) statutes already exist.
Perhaps, though, it'll be interesting watching the liberal "hate crimes" lovers explain why these "boys" shouldn't be charged with hate crimes :-) How would the social justice people address this?
Update, 5/29/07: Here's some interesting commentary on proposed hate crime legislation. See if it makes sense to you.