Number one killer of motorcyclists is single vehicle accident. In other words, too fast for the skill level.. I do agree though that larger vehicles kill cyclists unfortunately.I've been riding motos on the street for 45+ years now. Lots of mile too.
While I agree that certain personality types are likely not suited for the activity, how and where you ride does indeed effect your (potential life long) mileage.
Sadly I'm seeing a lot of cycling deaths in recent years too. In both cases mindless drone 'drivers' are racking up the tally.