I did not read every post here, so this may have been covered, but at least here in CO, and surrounding states, the fire bans aren't put in place by the campgrounds themselves. It's an area wide thing. This time of year is the worst because usually there hasn't been a lot of precipitation, but vegetation is drying out, lots of dry leaves etc.
Many of the larger forest fires here in recent years were man-caused... campfires not put out properly, or people firing tracer rounds during a no-burn day. Just a few wayward coals or sparks can cause millions of dollars in damage. So, yeah, sorry you can't have your campfire, but would you rather not have a place to visit because it all burned down due to a wildfire?