Why is it OK for Derrick to put:

"Of course normal decent people are upset by it,other people may think it a victory for their own twisted version of reality and go on to do similar things themselves. "

But twisting and distortion for Keith to put:

"and the normal reaction of decent people is revulsion, not a determination to join in continue the killing"

??

If you have the opinion that Keith means something different to Derrick then I think you need to explain that.