>>149875910
Because Batman will often take his personal feelings on the subject and impose his will on others to follow the same code.
Like a recent thread I talked about how Simon Baz once teamed up, and the whoke story Batman just kept bitching about the sidearm, even though Baz was like "You're the guy all about having a backup plan, this gun is mine. Also your car shoots rockets but a bullets are your hangup?".

Also while 60% of the time Batman is super strict and imposing, 40% of the time he isn't. And then you'll see him hang out with Red Hood or Katana who never hesitate to kill and you as a reader go "didn't you chew out Green Arrow in this other story?"

The best way to go is the Superman method, who has a personal code to avoid killing, but if we're dealing with it as the only option (Doomsday, that one time MXYPTLK went on a rampage, etc) he will do it only as a last resort, and with regret.

I often think about that Green Lantern comic where Simon Baz goes help Batman with a Scarecrow problem, and Batman gives him the stinkeye for having a gun all the time.
They even have Comissioner Gordon ask if he had a permit to carry, and Baz giving the 100% warranted response of "did you also check the batmobile is street legal? Because at least once seen that shoot rockets from the front".