> What does the fact that we can do something has to do with its morality?
The philosophy (and also practical issues as well) are not always so simple, so sometimes it might have something to do with its morality.
> Would you find it moral, if your mother had killed you?
No, especially after I am born. If it was before I am born, then I am a part of her body and she has the right to do so, although that still does not make it moral.
> Yeah I guess the Romans killed some non-physical ghosts.
They might not mean them as historical real people (which they probably were, although it is not 100% certain). (I cannot think of how to explain it better, but there is a difference.)
The philosophy (and also practical issues as well) are not always so simple, so sometimes it might have something to do with its morality.
> Would you find it moral, if your mother had killed you?
No, especially after I am born. If it was before I am born, then I am a part of her body and she has the right to do so, although that still does not make it moral.
> Yeah I guess the Romans killed some non-physical ghosts.
They might not mean them as historical real people (which they probably were, although it is not 100% certain). (I cannot think of how to explain it better, but there is a difference.)