Deontology is selfish. Deontology, in ethics, is where a person follows strict ethical rules without concern for the consequences. You can often see movie and Netflix series characters following this kind of ethical theory, especially batman. In movies and Netflix series, following moral rules without concern for consequences might be used as a plot device to give the hero the moral high ground and to wrap up loose ends by softening a villian's defeat, allowing them to make a return in a following movie with their life, gadgets and surviving henchmen (assuming they can use the hero's mercy to make a quick getaway). However, if you consider the death and pain that the villian uses their spared life to create, the hero's inaction is consequentially immoral because their inaction causes more death and pain than it prevents.

In real life, the consequences are generally not as extreme, but allowing conequences to be worse simply so that you can follow your rules is reprehensible no matter how small the transgression is. The reason why I despise deontology is because of what deontoligists could allow as opposed to what they will get the opportunity to allow. If it came to it, a deontologist would literally allow you to be tortured severely for an extended period of time and then be killed simply so that they don't have to punch the person attacking you and break their no violence rule. That should make it clear that deontologists are not considering your wellbeing or anyone else's wellbeing when they're following their rules, but would rather blindly follow their rules, either just for the sake of following them or to absolve themselves of blame, than genuinely help people who need their help. What did I say? Selfish.