Robrob
As an American you should consider the views of one of your finest occupants of the White House who offered the opinion that " There are lies, damm lies and statistics "
On the numbers given if a shared your veiw I would be calling for the C182 & PA18 to be banned from flying.
The USAF flight test people at Edwards had the T67 doing 14 turn spins with no ill effects so I doubt it is the aircraft that is to blame, I think we need to look at the training of those flying it.
Most of the aircraft that are reguarly used for spinning in GA that don't just fall out of the spin like the C152 & G115 have a reputation ( DHC-1 & PA-38 ) for not recovering from spins. Mis-loading and poor understanding of recovery technique along with misunderstanding the increase in roll rate in the final part of the recovery are all likely to be reasons that an aircraft fails to recover.