When I feel moved by a post in a direction that is not positive, I close the post and come back to it later. If it still moves me in the same negative direction, I formulate a response in a word document, save it and close it and come back to it later. I then reread the original post and my response in word. If my response comes out "right" without any harm being done to anyone, I post it. If not, I edit it or just delete it and decide not to respond after all, as my response might actually be more harmful than the original post.
I know this takes a tremendous amount of effort, but too of