Fish in a barrel.
IMO we need to be armed at all times. Right now our only legal option (in CA) is locked container carry. Of course, a loaded, accessible firearm would FAR better, but hopefully you would have 10 seconds to retrieve, unlock, load, etc before you needed it.
Over on Calguns.net there are a lot of nay-sayers going on about how events like this are going to prompt further restrictions on ownership/possession. I, however, think these events can be presented as evidence when it comes time to challenge school zones and loaded weapons statutes.