It looks like from what we know, 2 high energy (it's much less common with low energy) photons collide and change direction: from what I understand, they don't

It looks like from what we know, 2 high energy (it's much less common with low energy) photons collide and change direction: from what I understand, they don't split into low energy photons. It'd be basically impossible for all the high energy photons to scatter directly away from earth (why would the earth be special?) leaving only low energy ones towards us.