Having you own morale and ethics is far from futile. Each individual should be able to question the law and object taking part in something they don't agree, as long as it doesn't break the law.

Killing someone is legal in certain countries for different reasons (I'm not talking about war). Not sure I would like to get involved in that business, for instance if I don't agree on how and why people are sentenced to death in my country.

Some people are built with low ethics. Sure, if it's not made illegal, they'll always find someone to do it. Looks like in that case it might be illegal, as TV makers are sued.