BC, An insult can never be equal to a cost of life. That is common sense and rule of law.

But what is also common sense is that if a certain group is known to kill people when you insult them, then you might want to think about it a little and use some prudence before provocating them too much with insults.

Obviously, such extreme act is wrong on all levels but lives have been lost already, noone can bring back the lives. A little prudence could have perhaps prevented it.