It's worth remembering that Earth got its atmospheric oxygen relatively recently (geologically speaking). Two billion years ago cyanobacteria figured out how to use photons to produce energy, liberating O2 in the process. The rise in O2 killed off many then-living organisms - what we now call the 'great oxidation event'.

I'm a bit gobsmacked that whatever is creating O1, is doing it fast enough that there's more of it than O2 or O3. If you look at Earth's 'ozone-oxygen cycle' O1 combines with another O1 or O2 very quickly after single O atoms are broken away from molecules.