Yeah, a tree in the chops will mess up your day, but it fo' sho' ain't the only way the Rockies can getcha.
Avalanche
Rock slide (a hundred-ton rock falling on something is very final)
Flood (Check the Big Thompson Canyon flood in 1976...I got to help clean it up and it was certifiably bad stuff even by 'Nam standards.)
.
.
...lots and lots of other high-altitude ways to end life but one point really covers the whole deal:
The Rockies are what they are and really just don't care about puny little things like you. Trespass on them with care and infinite respect.
.... snowbound in the Sierra Nevada mountain range, resorting to cannibalism....