I don't support hunting rifles being legal either. In the spirit of the second amendment, I think that guns should be legal solely for the purpose of self-defense. A hunting rifle is overkill for that purpose, so I don't see there being a reason that it should be legal.
But why? It's not like Joe Blow Gangbanger is using his 30.06 or Barret .50cal to rob the local Target. A hunting rifle, no matter how powerful makes for a really sh**tty weapon of crime. Even the Aussies and Brits understand that. Ignorance of something is no reason to want to ban it. That's how we got into the stupid war on drugs.