Surely, the facts are irrelevant - the point is that it's all about perception -the only performance indicators the travelling armchair experts get of our flying skills are the PA and the landing.
Of course, the PA has nothing to do with it, but it's often all you will be, wrongly, judged on, hence many companies insistence of the PA's importance.
Anyway, to give you someting to get the knives out for, it is my opinion that there is a perception amongst many that some parts of the world are not known for he excellence of the training or attitude towards avaition - which can be correlated to social norms: evidence the cultures where subordinates are not free to speak up, the loss of face as a result of a go-around, etc, etc. Papers have been published, recently, on this stuff (so it's not really just my opionion.). That said, there are good and bad from everywhere.
Historical accident rates speak for themselves and they are not racist.
Sorry, the truth is out there.
TM