This will continue because of cowardice, unfortunately. Integrity is one of the only things that separates moral and ethical action. In the moment, groupthink/mob mentality/group mentality led to conformity which is exactly what happened, and is an extreme form of pressure. Regardless of the action/inaction in the moment, integrity was challenged and defeated. One of the only ways this will change is something that will probably not happen due to conformism within the system. You lived how hard it was… your integrity was challenged, and ultimately inaction was the choice that was made resulting in net zero integrity.
As everything in hindsight reveals the truth, the inaction feeds conformity. If it’s never challenged, then it evolves into a “norm.”
Are you sure it wasn’t sociopath? It does take a certain amount of decision-making lacking empathy or remorse.