Final answer:
The author's attitude towards the youngest rioter in the mentioned lines is critical and judgmental.
Step-by-step explanation:
The author's attitude towards the youngest rioter in the lines 'for this young man was utterly content/ to kill them both and never to repent' can be described as critical and judgmental. The author's attitude towards the youngest rioter in the mentioned lines is critical and judgmental.
In the given lines, the author portrays the youngest rioter as someone who is willing to kill without any remorse. The use of the words 'utterly content' suggests a lack of empathy or sympathy towards the actions of the youngest rioter.