In a direct, causal way. Not "somebody inspired a mob. As a result, somebody had a heart attack and died, another who probably didn't participate in the raid also died of heart disease." They were there voluntarily, had heart issues under treatment before they went, and their hearts didn't hold out.
Another was said to have died from being trampled during the raid--but the coroner's report a month later pointed clearly to acute intoxication with a drug, possibly prescription. And the police narrative shifted from her dying from being trampled to her collapsing while standing untrampled off to the side.
There'll never be consensus over Sicknick. Originally hit with a fire extinguisher, that was later said to be misinformation. Sprayed with bear spray, he was fine a few hours later. Bear spray is just strong pepper spray, it would be interesting to see the incidence of stroke in the 24 hours after being sprayed in the face with oleoresin capsaicum (which I had a heft dose of orally two days ago when I made a large batch of enchiladas michoacanas). Hours after the pepper spraying he had a stroke. Coroner said "natural causes", but everything that happened on 1/6 is adduced as a trigger. Then again, lifestyle, genetics, development, and his job all may have contributed to his stroke--strokes are often long in coming. (On the other hand, I'm not sure that I experience the greatest stress hours after the stressor peaked. My father had a stroke while eating dinner. Was it the dinner? The conversation with his wife, usually loud and bullying? Or would it have happened if he were watching tv at the time and his team lost? If not then, when? Who can even set up the probabilities?)
Then there are the 4 police suicides. Now, for compensation there are good reasons to relate the suicides of the two Capitol Police to duty and not to personal issues. For political reasons, it's good to relate them not to routine violence in DC and overwork but 1/6. Months later two Metro police committed suicide, one was involved in the curfew *after* the riot and another retook the building. Both had other issues and the politics were more distant by then, but still present. But if for the first two a connection could be drawn, for the second the connection is pretty hard to follow unless you just connect the two dots and ignore the 180 days intervening.
Causality, hence legal responsibility (as opposed to some general political or 'moral' responsibility), is a lot harder to prove.
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