iirc L-aminoacids and D-sugars, that is these observed in nature, are very slightly more stable than the opposite because of weak interaction

probably it's just down to a specific piece of quartz or soot that got lucky and chiral amplification gets you from there

also it's not physics, or more precisely it's a very physicy subbranch of chemistry, and it's done by chemists because physicists suck at doing chemistry for some reason (i've seen it firsthand)