I would even take it further ... or this may be included in what you are saying. The negativity that people so vehemently express in these Debate Forums is very largely an expression of the negative state of their health and spirits.
They feel negative physically, and it expresses itself emotionally and intellectually. Or (and this is probably more often the case), the dis-ease or maladies they suffer from are outward (gross) manifestations of the emotional and intellectual negativity they host within themselves.