Descendants of the Stable Dwellers who survived the Balefire apocalypse and emerged into the irradiated ruin, the common pony of the Wasteland was raise and most likely born into the hellish environment. Those who reach adulthood show their competence to survive in extreme conditions.
Scavenging, hunting, and even being hired as slavers for a living, they will only be hostile to you if you give them reason to be. Otherwise, they'll mind their own business. But who knows? You may find a trustworthy companion somewhere in their ranks...
So is there a reason, YOU, are the one with the pipbuck? Biased much? Though, I do like your blade. Very nice. Any cut at all will put them out of the fight. At least, if it's a pony.
I like the middle one's hat. The gun on the one to the left looks odd in that the magazine is pretty close to the front and is backwards... But hey, that's relative to real world guns, and this is both Fallout and MLP we're talking about!