It should be noted that the reason Diya is prescribed is that although the one who has injured the other person, didn’t do iton purpose, what he did gave rise to the injury.
There are different categories of punishments in Islam which are different based on the crime and its detriment to the society and the victims
And give the women [upon marriage] their [bridal] gifts graciously. But if they give up willingly to you anything of it, then take it in satisfaction and ease.
It is to be said that the punishment of some of sins and crimes is also freeing the slaves based on Quran:
It is to be noted that even in such circumstances Muslims had to follow justice and peace:
According to this verse, Muslims are not even allowed to insult non-Muslims. So how is it possible that Islam recommends its followers to kill or torture the Christians or the Jewish?