[qball]

>Are people inclined to start shooting game wardens/park rangers?

It might be a small factor, but not really. Legal gun owners aren't typically the ones using them against law enforcement anyway (it's not much different than Europe).

Remember that you (as US wildlife enforcement) are a long way away from civilization and medical aid. As such, the chance that you'll potentially be dealing with animals with sharp teeth, claws, and fangs is substantially higher than the average person going fishing on Saturday once every few months. This is the reason geological survey crews (like the USGS) tend to be armed as well.

Contrast this to Western Europe, where any animal of sufficient size to harm a human is endangered if not already extinct. The density of civilization is much greater than it is in the US; if you are injured by something a gun can defend against it's much more likely you'll be quickly rescued. The requirement you be armed out there is much less.