“I’m not aware of someone being declared a mamzer”
Thats a great example of how certain halacha works. Rabbis found a way not to declare people mamzerim and sell our chametz and build an eruv.
“made a klap on the bima to announce he followed it and it would’ve been reported in the Hamodia”
Im pretty sure there is a difference between that and about never hearing about this happening once- ever in modern history. If a woman was left to drown even once I am sure we would have heard about.