I grew up in Southern Arizona, not far from the US/Mex border... 40 years ago, things were not so bad, a few illegal aliens crossing to work the picking season in the states... Things are not so friendly anymore, sure, you still have those looking for work and wouldn't hurt you... BUT there are those trafficking drugs that are armed and the story is not so mild...
The last few years before I moved here, I would prospect areas I knew, near where I grew up, and we frequently saw small bunches of illegal aliens dressed in black-op style clothing and/or camo wear, carrying backpacks and firearms... And there are those from way south around Sinaloa or Asia or the MiddleEeast... These are the bad guys!!
I actually tripped upon a smuggler's drug stash once; I just minded my own business and acted as though I didn't see or smell anything as I continued to walk away until I got out of sight in the next canyon... Then, I called the Border Patrol with what I saw and the gps coordinates... I later found out that the BP caught 12 guys all armed and over 600 lbs. of drugs...
Did I carry... Hmmm, you do the math... and I really hoped these situations wouldn't turn violent, a wheel gun is no match against several AK-47's
Like Eagle says, be aware and observant, and don't be afraid to venture out from under the bed...
I might add, avoid a skirmish if possible... The authorities have more tools, both on the ground and in the air, than we do... inform them of the situation and where it is occurring... AND if you decide to carry a firearm, take a class and read the laws of each state you apply, these are super important and may differ, and you can think you are in the right, but wind up in jail... My buddy in AZ told me after he took a carry class, "I am glad I took the class and learned the what NOT to do."
Have fun camping, be aware of your surroundings, and be smart, not afraid...