This is a very non-linear effect which Levy notes. In my experience and obsevartions the more we try to entrain, to capture in our mind and emotional mind the emotive experiences of many many others, or even not so many, but more than one or a handful, we start losing empathy and grounding. We tend to become on one hand cold and uncaring or on the other an emotional meltdown worthless even to ourselves and very a pain and distraction to others. Careful use of words, logical thought, small acts of grounding and of tenderness towards others can re-establish normal human emotional, social and intellectual bearings, but I do not think it ever gets as bad as Primo suggests -- unless we are insipidly indulgent, or so cold we no longer care for anything. Again, the two overdriven types of human response to massive tradegy, and also massive anti-tragedy.