The FAA wanted to pull the type certificate back in the 90's because of the large number of accidents, Frank Robinson came up with the idea of the SFAR73, another problem for the FAA was that they might be held liable in a way for the past accidents and decided to go with the extra training.
The fact there are more aircraft of the type and so there are more accidents doesn't cut it for me, every accident is one too much, in the case of the R22 most are deadly as well. It should simply not be on the market.