Yes for sure, you never know when there are exigent circumstances. Rather than assuming the worse of others and getting irritated, let's first ask some questions.
Festival organizers or campground staff should be available to "put out the fires" (as Gary and I say) answering questions and finding solutions as issues arise.
With many situations, depending on which side you're looking at, there are different perspectives and circumstances:
Would it have been possible
for the MH to have parked a little more away from the center of festivities? Could the jammers have moved the gathering a few sites over?
The take away is that we share this planet with folks in a wide variety of situations. Let's each try to think through the impact we have on our surroundings and be courteous of others while we go about our lives, so that everyone has fun.