'Capable'. Yes. If they are so taught.
Morality is a main teaching of all major religions. When religious teaching is reduced, something must necessarily fill that gap just to maintain the status quo. However, the filling of that gap is obviously not coming from improved parenting. And you will not find street creed filling the gap, which is where ever more young people gain their sense of morality today.
Atheists are the fastest growing religious identification (a seeming oxymoron) group in America. If we eliminate God and a fear of reckoning, anything would and will go. At that point, our society would have reached the apex in liberal permissiveness.
Don't look past the tremendous restraint that a God figure places on our society and various cultures. Remove that restraint and our society would be a very, very different world, and the behavior that we detest today would become still far, far uglier.
I don't discount the possibity that someday we will become a Godless society. The good news is that I don't expect to live to see it.
FWIW