In my case there's a popular area for climbers on a fire road near a river close to me. Many of these folks just shit arbitrarily in the woods, and don't even bury it. It stinks, attracts animals, and makes it impossible to go on hikes. A friend's dog even ate some which had THC in it from someone who ate a marijuana edible. And let's not get started about the risk of forest fires in the dry season.
There are some that are better about managing their waste and overall footprint, but there is an outsized impact from the less considerate.
There are places where these concerns are real and are having actual and increasing impact. Dismissing these concerns is not helpful.
God forbid someone talks to them about what we do with dog and human baby shit.
There might be something wrong with your baby, or maybe you have babies? When I had my first child I naively thought they shit all the time (like all day - I was an idiot). In reality, they typically shit once a day (like us!), so maybe 5 total diapers, but not all are shit filled.
Site note: We used cloth diapers for both our children and urine (that's been sitting in a diaper pale) is by far worse than shit smell.
I don't even have kids, and I know that's not true.
Source: might not be a parent, but I'm a hell of a babysitter.
Well, if you're "parked," there's a good chance that there are restrooms.
You can carry a portable toilet. Or a bucket and kitchen trash bags. I'm an over the road trucker, and in an "emergency" I have just closed the curtains, squatted down in the back and pooped into a 13 gal kitchen trash bag. Not at all comfortable, but workable in an emergency.
Store the bag outside in the spare tire, until I get to a suitable dumpster/trash can. (And I doubt that my rare, once or twice a year "dump" compares at all to the daily disposal of diapers on the road and at home on garbage day.)