I'm saying
if you want to find the government assassinations,
here is where you'd look. Again, I'm not saying that these were assassinations (other than the ones which are commonly considered as such). But they're deaths in office.
Actually, I was a bit surprised that there were as few assassinations as there have been (what with some 500+ high national political figures at any one time). The Democrat/Republican balance is also interesting.
"Accidents do happen [but] plane crashes can be awfully convenient," doesn't leave me any room to debate this topic with you.
Believe it or not, I can accept issues as unresolved, though with shadings of possibility or probability one way or the other. When I say "I'm not convinced one way or the other", I mean just that. I've also not really put much time into looking at any of these incidents.
I do leave the possibility open in the case of Wellstone and Carnahan. The circumstances of Litton's death (how often to airplane crankshafts break spontaneously?) are interesting. Ryan and Jonestown: pretty clearly a cult.
There's also the case that there can be actions involving some elements of a government in opposition to others. As Kenneth Arrow observed, firms aren't single points, they're structures with internal complexity. As are governments. Operation Northwoods and The Business Plot (https://en.wikipedia.org/wiki/Business_Plot) are both indications that plots have been hatched in the US. It can happen here, and very nearly has.
The circumstances surrounding both the Wellstone and Carnahan deaths were extremely politically charged. In Wellstone's case, former vice president Walter Mondale stood in as a candidate 11 days prior to the election. In Carnahan's, his name remained on the ballot and his wife served. There's relatively little dispute over the official investigation of the Wellstone incident, and some history of concerns with the principle pilot. As you may recall, Carnahan's opponent was John Ashcroft who went on to serve at Attorney General in the 2nd Bush Administration. In both cases (as now), control of the Senate was in play.