User blog comment:Merganafan23/Character ages/timeline/@comment-24.26.233.208-20120805002001/@comment-5102537-20120805095535

It would have not only been a mark on his honour but it would have also disgraced Vivienne and Morgana. Gorlois' reputation would have suffered too. Illegitimate children were dishonoured and often even killed back then. Former friends of Gorlois could have demanded justice for it which could have brought damage on Camelot by bringing up tension between the kingdom and other houses or maybe even kingdoms. Adultery was a crime and I doubt that Uther was the one who made it a crime punishable by death. The rules of society had always been extremely strict in those times and people died due to things we would laugh about today.

In my oinion it was absolutely comprehensible why Uther kept it all a secret.