“Walter White would never” Walter White helped the cops catch his own criminal alter ego because they were about to blame his crimes on the wrong guy, and he couldn’t stomach the thought of someone else taking credit for all the terrible things he did. That’s the beauty of Walter White as a character, at least from the perspective of transformative fandom: he would. He’s such a ridiculous man that literally nothing is out of character for him, provided you can contrive some circumstance where doing so would serve his ego.