Because post-skip Kid is garbage.
Pre-skip Kid was crucifying fodder for being too weak willed for his liking. Post skip Kid is a neutered Luffy cheerleader who can’t be allowed to be seen doing anything nearly so hardcore. So he lets off a guy who betrayed him, leading to him being tortured and Killer being fed a SMILE.
This guy
was great. How that squares with doing nothing to Apoo is beyond me.