I feel I am not authorized to answer this question. As a laywoman I would leave it to the ruler and lawmakers alone to make that decision. And whether I agree with their decision or not,I will then abide by the law.
Privately,if I knew this individual personally, I would call them to a side and ask them first what prompted their actions. I will then advice them, with the best of manners, of how harmful and hurtful such actions are, and how as peace loving citizens, it should be upon us to behave with respect towards other faiths and cultures and promote tolerance.
I will also try my best to repel all those false notions they have for which reason they did what they did, by educating them with authentic proofs.And if they accept it from me I will be by far happier then than I would to see them punished and humiliated.
I believe this is my duty, as a Muslimah and as a woman who wishes to see peace and tolerance in any society.