"Climate change is a bunch of horse poop. Natural fires have happened since the beginning of recorded history."
I don't think climate change scientists are arguing forest fires never existed until recently. Even if you think that humans have nothing to do with the rapid rate of climate warming (warm periods have happened historically, but warming this fast isn't normal and species won't be able to adapt quick enough), you can't argue we aren't putting out a ton of C02. Even if C02 has nothing to do with the warming, a full 25% of C02 gets absorbed by the ocean (cold hard fact) which creates carbonic acid (cold hard fact) which is what is causing ocean acidification (cold hard fact). This is a current and impending crises for the earth's oceans as it is killing off coral reefs, preventing mollusks and shellfish from crafting shells etc. So even if climate change is horse poop, we still need to stop emitting C02 or we're dealing with large scale ecological problems which are going adversely affect humanity. Be a part of the solution.
I've probably read too much Dave Foreman and Ed Abbey to really have a fair and balanced view anymore. My earlier comments on grazing were broad, but I was referring to large scale/quasi-corporate grazing on public lands, not private ranches etc.
Livestock grazing can be done well when the ranchers have a genuine interest in preserving the land - which is often the case as you mention either through private ownership or shared use of public land by a small group of ranchers. The problematic side of grazing is when you get too many parties sharing public lands, which can lead to a "tragedy of the commons" situation where backing off and being responsible just opens the door for someone else to exploit the land.
The forest fire/climate change/pine beetle situation is complex. What we do know is that temperature has a huge effect on juvenille survival of pine beetles (Bentz and Bracewell, 2011). So as things heat up even 0.5-1 degree we get (1) highly increased over winter survival of pine beetle juveniles and (2) expanding distributions of pine beetles as they move their range further north. So climate change contributes to forest fires both directly (hotter, drier) and indirectly (increased fuel via pine beetles).