I could throw in - not evidence-based, but definitely my impression - that most senior HCPs are absurdly busy, and many more junior HCPs (who could also be busy) perhaps feel 'uncertain about' getting involved in social media debates?
That changed a little in the Bawa Garba debate - junior doctors emerged from the shadows for that one. And my lack of 'tolerance' you mentioned in that case relates to the absence of adequate evidence to support extremely vocal claims of injustice/scapegoating, interestingly.