What's bad is not the immediate outcome. What's disastrous is what happens in the long run.
As long as we stick to all sorts of morality, we are not doing great/noble things out of the goodness of our hearts. We are just following a code. After some time, people will forget the true meaning of noble acts and they will be trapped by dogma. The essence of goodness will go extinct. The world will be left with an empty husk. That's why we all have to rid ourselves from morality and act on our own reason and insight. Then we won't lose the track of the true greatness.