geto was burnt out mentally, his cursed technique burnt him out, haibara and amanai dying on him, and the two girls that were imprisoned
that was the path he chose for his life, and he did have someone to relate to, until he thought his ideals were meaningless and weak willed so he chose that for himself.
oh and botslayer keeps doing what he does for like a month at this point if he wanted it to stop he would've changed yet nothing happens so actually no