Because I think it's important.
Discussion
An opinion doesn't provide the basis for an effective morality.
It does on the personal level.
That's debatable. But even if it were true, how effective is a morality with no weight other than an individual's personal opinion? How would you cross the can/should gap and say, make a law or prosecute an evil act on the basis of a personal opinion? Is a morality effective when an evil person can eliminate the foundation of morality with a single bullet? Because history proves they won't hesitate to do exactly that.