would add to list of causes two other factors:
One, what I observed as a decline in rhetoric in social and political discourse. Many of us seemingly cannot communicate specifically, precisely, or accurately.
Two, the elevation of emotion over rationality. Feelings have become more important, in discourse and as a basis for decision-making, than logic. Everyone has emotions; many seem to think they are entitled to thrust them into the spheres of communication.
Your piece is well-written and insightful, IMO. Thank you.