Let me explain: When you do a risk activity, the way to mitigate risk is to bound the situation to keep all variables within safe margins.. For example, on aircrafts we look at the mean time of failure on a part, then you replace the part before it gets there, so you reduce the chances of it failing..
On adventure sports we do the same. When Skydiving, Rock climbing, Paragliding etc.. you keep looking at accident causes and develop a plan to avoid those situations.
So, If you do follow all the existing safety procedures,and still get in trouble, it is probably an accident, something you could not prepare or account for. (procedures are then created to mitigate its repeat occurrence)
On the other side.. if you disregard the safety procedures (push de envelope, as we say) and get in trouble, then you were reckless, and you paid heavily for it. That is NO accident. (if you get away with it.. you were just dumb lucky)
My point is.. I bet the micromorts computed here are based on "all" accidents, not on accidental vs reckless deaths.
With all due respect to the death.. if you seen a cluster of 20 deaths within a small group, you need to look closely at the reason why those deaths happened.. Where they trained properly? Where they at the appropriate experience level to engage on the type of activity they where doing? (RW, CRW, fast landings etc) Where there other external factors involved? , was there a single significant accidental event that affected many members of the group at the same time? (Aircraft crash for example..)