Hmmm, I was about to go for it , but now realise we are talking about fatalities since the year 2000, not the last 100 years. That said, you are underplaying the figures -
10 fatalities in Irish road racing since 2000.
29 in British national and club series since 2000.
Also -
200 fatalities...
Why do they do it? Because they are adrenalin junkies.
How are they able to do it? Because the IoM firstly needs the income the TT provides, and secondly has the balls to tell H&S to go Google themselves.
There are many analogies that can be drawn - mountaineering, single handed long distance...