All the events you just named happened under controlled, supervised, official events. Im sure there was enough thought into what could happen and as you mentioned, barriers put in place to protect. The wheel is unfortunate and very hard to protect against. Ad into that, there would he paramedics, fire crews etc on scene ready for an incident. In this case, i doubt any were on hand in readyness for a problem.
None of them are comparible to a charity event on a suburban roped off street imo.
I dont want to start a fight, but i dont think im being harsh by saying driving a 3000hp funny car on a city street with a few thousand people standing behind rope is stupid. Driver and organisers combined. And we dont really know the full events to just blame the organisers. Was permission from the appropriate authorities given for that car to actually be on the road? if not that comes down on the driver. So therefore, illegal car speeding on city street killing people, in anyones language = serious charges.
Just my opinion, but more and more in this world people are trying to palm off their own actions and place them on another.