The top killers in Yosemite at least are falling into water and falling off rocks. I read Death in Yosemite some time ago - it is a difficult read but the info goes back to the 1800s at the very beginning of the park, and is quite enlightening. In more recent memory, there are lots and lots and lots of people who die of natural causes (like heart attacks), rocks, water, and a whole slew of other things like plane crashes, car accidents (a vanload of kids was among this year's tragedies)... very few animal related deaths. Some of them weather was a factor - the slipping-off-Half-Dome sorts of deaths usually happen because people don't pay attention to the signs and verbal warnings and just do it anyway.

Animal deaths just don't enter the picture much, at least not in California. Lion attacks get tons of press, but the ones I've heard about are not in what I'd think of as the backcountry. Lightning doesn't seem to get a similar amount of attention, perhaps because it's not something you can do anything about...

This document at the CDC website has statistics on US lightning injury or death - still sobering how many actually happen, and how debilitating an injury can be.

What we can do in terms of avoiding lightning strike seems to fall under risk reduction, not risk elimination. Still probably not going to happen to many of us in our lifetimes, but still a risk.