It's really hard to argue with a personal decision made with good reason.
With that said, however, there is enough shared experience to support the comparable killing ability of lots of non magnum cartridges. I recently had to defend my camp from an Alaskan mountain grizzly with a 130 ttsx from a 308, and I am happy to report that he couldn't have died any sooner unless shot in the head. There are just so many variables that do into turning out the lights on a large animal, that the only way to go wrong is to get stuck on just one of them.
+1
Mark Begich, Joaquin Jackson, and Heller resistance... Three huge reasons to worry about the NRA.
