Things such as: murder, stealing, rape, racism, phobias against various groups of people. Is there really any controversy about these?
Of course there is.
What killing does and does not constitute murder takes a load of our judicial system. But even further than that, abortion is murder to some of those against abortion, the meat industry is murder to some vegans, our military industrial complex is murder to some pacifists. In reality murder is legal term, and any of these could be murder depending on who is voting for them.
Same with rape. Statutory rape and where age limits should be is argued over. Having sex with an unconscious person, or having sex with an unconscious person who drank too much is rape, people argue about that. Where the line should be on having sex with people with severe mental handicaps and what is protection from rape and what is ableism is argued about.
Some people think taxes are stealing. Some people think you can't get to become a billionaire without stealing.
People argue about what constitutes phobias and racism all the time.
All of these things are controversial, and all of these things have nuance that need to be explored so that we don't create over simplified black and white scenarios where we rely on virtue ethics rather than the consequences of those actions.