Because they are evil, those heavy sniper rifles.

After all, they are used in crimes all the time. right? Hmmm, the US Military kills terrorists with them and I've think I've heard of a pig or two shot with them. But they are big, scary, and illegal in California - they must be bad.

If this works, next time it will be medium sniper becasue no one need more than a 30 caliber to hunt, then military types calibers, like in Europe, because those aren't sporting rounds. And eventually we'll be like the Brits, disarmed peasants.