But what if OP accidentally farts while running?

We all make mistakes, after all... we are human. Don't sweat it OP, nobody is going to remember it and you probably won't see those people again. Just make sure to not eat too much mexican/indian food before planning to do some shopping next time.

You have to move slowly or the smell will follow you.

Your right it should be considered no worse than a yawn or hiccup. (I think they can be really funny.) However "eliminating" the stress and embarrassment would make them mundane and all the humor would "evaporate". I'd rather they be funny and everyone have a collection of good fart stories. It's one of the few things that can keep even the mightiest ego humble.

You can normalize it, but it doesn't eliminate the god awful smell.