“Will “diversity” cause more plane crashes...?”
COUNT ON IT.
Source: am former flight attendant and have seen many hires that were crap pilots who were babysat, pushed through.
I do not care what race, color, or sex my pilot is. I do care that he or she black, white, asian etc. be competent, sane, and hired on merit only.
I have been flown by all the above prior to the lowering of standards. I had no qualms. Today I am not sure.