This seems pretty tame, IMO. I think these folks should pick their battles. Better to have intelligent kids making noise (as they'll probably listen to you when you ask to quiet down) than to have belligerent kids who were raised with poor manners.
As for darting out into traffic, there's an Android app for that, right?
This never happened. What you imagine Google interns to be like and what they actually are seem to be disjoint sets. Music isn't even mentioned in either article or the Yelp review.
And I am somewhat suspect of the claim that Google interns are darting into traffic. The problem is if it happens even once by accident, you'll have residents complaining that it's an epidemic.
The apartment complex should write lease violations to offenders (or Google)