It's an explanation, but not an excuse; he still did what he did. Do you believe he should be treated not compos mentis and have his agency taken away?
Similarly, as bilekas suggests, the fact that "'trolls' are seen as cool in the online world" gave this man an active feedback loop for reinforcing this behavior.
Well, even from that perspective, "society" is giving him some strong feedback that this is not acceptable.
> Well, even from that perspective, "society" is giving him some strong feedback that this is not acceptable.
With the same reasoning, you can argue that people in this kind of internet forums gave him a strong feedback that the "society" is wrong here.