I do not think that "a failed design of exactly one kind of MGB that kills people" is supported by the numbers.
It would be lovely to live in an alternative universe where the perfect safe helicopter was possible but we don't. We edge safety to ever-greater levels as the technology allows. The current generation of rotorcraft in this weight class have done this quite successfully. That success continues.
Damning the 225 in the current circumstances creates a very real risk of replacing it with something worse.