SWATTING isn't a light offence. When you do this there is a very real possibility that someone will end up dead because a cop gets excited, or a homeowner is armed and decides to start shooting. This should be treated as a very serious crime, and if anyone is killed, the person doing the swatting needs to get a murder one charge slapped on them.
Moreover, this kid didn't do this once, but many times, demonstrating that this isn't a spur of the moment 'crime of passion', but that he possess a consistent and dangerous disregard for life. I am all for lighter sentencing for a lot of things, but this is something that you need to come down heavy on people for. Grafitti is stupid teenage hyjinx. SWATTING is really dangerous behavior.