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Of course, to the extent that influential sectors in the culture are consciously, deliberately making war on God, and thus on His law, I suppose it is to be expected that peoples' expressions to one another will become increasingly self-referring, disordered, irrational, even vicious.
The way I explain this to myself is to say that under God, there is a common, shared ground of being and thus of discourse. The enemies of God and Western culture more generally know this, which explains the hostility towards God -- and towards man by implication.

But one would think that Christians, of all people, would not be prone to the descent into personal abuse of one another on the basis of doctrinal differences.

What an outstanding analysis of the situation and what is "at stake."

Thank God for you, dearest sister in Christ!