So would you be happy if you could talk to the druids outside and some/one of them would hint that that Kagha is prone to violence? And then that would open up a dialogue option w/Kagha where you say "Make your snake back away from the kid and then we can talk" If so, I 100% agree.

As to you example, you can only find this letter after the kid is dead, right? So it's not like you could confront Kagha and use this letter to save the kid???
But yes I also agree that once you find this suspicious letter, you should immediately be able to talk to Kagha about it. That's just common sense.