Ethical Theories

In my opinion, deontologism is most appropriate ethical theories. Whatever we think "what should I do?", we may not be able to find reasonable answers unless there are fundamental duties or obligations. For example, when we discuss whether death penalty should be legitimized, advocates may argue based on moral duty that murderer should be punished, and opposites' opinion will follow their obligaitons that we should not kill other people no matter who is evil. As you see, some opinions in discussion may obey their moral obligations. However, it doesn't mean that we should just follow those duties. There may be some issues which cannot be solved from one rules such as surrogacy or transplant organs, and so on. When you discuss something controversial matters and argue your opinon based on some obligations, You should recognize that those obligations makes matters solved.