Mighy - I agree with URworthy - responding only fuels the fires in my experience

He will not read it and think 'Gosh darn she has a point, and a good one' He will react and build another layer of defences. AND it will show him he is getting to you (which is part of all of this, believe me).

Our blank apparent indifference is the only way we can deal them when they are in this mad stage of Replay (not a great fan of stages in terms of time line, but it is useful for dealing with them in emotional terms)

Polite when they play nice, otherwise, ignore completely. Dealing with us, demonizing us, takes their focus of them and their miserable sitch.

Cali is right about planting seeds, but this isn't the soil, yet.

And kml and WOnka are right in that it is perfectly OK to put your point of view. And it is a great response But we are not dealing with people who are currently rational in any way shape or form. Sadly.