If it's a homicidal wacko or a mountain lion, you'll be dead before you have a chance to even think of your gun. If it's a grizzly you better have a .50 pistol (which is really a hand held cannon), although a bottle of bear grade pepper spray is far more effective (blocks both vision and smell rendering the bear completely incapacitated, and takes a lot less skill to use effectively). For a black bear, just bring an air horn, although in my experience yelling and waving your arms is more than sufficient.
I have met camo wearing whackos dumping out their meth-lab waste on abandoned roads deep in the woods (at least whatever he dumped had the acrid burn of meth lab waste, and he definitely looked drugged out). Although he was surprised to see me, I made it clear I was going to disregard him, and he decided to disregard me. I'm sure if I pulled a gun I would have been dead in no time flat (hard to have faster response times than a coked up whacko

).
In my experience, most of those wanting to haul their favorite revolver into a national forest are fantasizing about pulling it out and scaring the shit out of someone who's looking at them wrong. But, I just keep in mind that these same people often wind up accidentally shooting themselves instead.
Along the same lines, few things irk me more than hearing a bunch of guys talk about how they downed a few 30 packs and then went out hunting. I grew up in rural Maine, and even though we've lived in a neighborhood, we still heard very close gun-fire followed by drunken hooting and hollering. One year our neighbor's prized steer got shot and left to rot in the field next door. I guess some drunk yokels got frustrated and thought it would it would be manly if they shot a tame steer, and left it to rot. Whoever thought alcohol and firearms together was a good idea?!