An Obscure Planet

There's a Ballard story where an alien intelligence surveys
a future earth, finding abundant trace of civilisation, a huge,
still functioning computer network, and no people. It transpires
that we downloaded ourselves into computers because
we preferred living as virtual selves, but exhibited such violent
behaviour there the computers, which had become sentient,
decided for the good of the planet and their own protection
they would lock us in. All of us. Now the question I think
is posed here, but which Ballard does not realise is posed, is
Are the computers here behaving amorally or morally?