Amusingly enough, and I've posted this before, do you know when motorcycling fatalities had their largest increase in the UK? It was after helmets were made mandatory.
A false sense of security was undoubtedly part of that. Lots more people on the roads, travelling farther meant more total accidents.
Is that due in any part due to the 40 somthings who bough bikes during the 1990s and found them far too powerful ?
Have you taken into account, cheaper more reliable Japanese bikes being bought used? Variables are everywhereThe rise was 1973 to 1980 so probably not, no. The 1990s showed an overall decrease in bike deaths but there was a rise in the last part of the decade. Clue's in the graph