Morality in non-social contexts

Rabbi Michi,
Can you please explain to me in general terms what you think is the problem with the prevailing moral view today that says you are allowed to do whatever you want, as long as you don’t harm others? What is the problem with this view? (Such as there is no problem with having sex before marriage, as long as it is consensual) (It supposedly allows for maximum individual freedom, and you are very much in favor of this. I am aiming for the answer without getting into the religious dimension at all, because the basic premise of religion is often that there are things that precede morality, such as sacredness, etc., and then the problem is clear anyway)