> sofek mamzer is worse off than a known mamzer.
if everyone is sofek mamzer, then nobody can marry nobody, except those who are mamzerim vadai. In such, invesrted, world, hasan and kalla would need to bring kosher witnesses to certify that their parents were brother and sister, or bring a ketuba with other than a father’s name, and beis din need to investigate date of kesuba being before the birth. I am sure, there will be fakers, who will not reveal that the husband gave a get, trying to fool this opposite beis din.