How so? Church teaching is clear. Divorcing and then entering into a second marriage without obtaining a decree of nullity for the first marriage is adultery, and anyone who takes this path is living in an objective state of mortal sin. Those who choose to ignore this teaching and refuse to submit to Church authority are in effect setting themselves up as their own ultimate authority. In such cases, one has to wonder why such an individual would even care about Church teachings of any sort.
No one is forced to be Catholic. We' re all free to take it or leave it. We're also free to defy God and to suffer the consequences.
And, it is illogical to say that “Marriage is Public therefore -—” at all on this issue. It is an ignorant, contradictory statement in that:
ANNULMENT even if the formal, External Forum is used, is PRIVATE!
Nobody gets to know the results without the consent of those involved.
So, what does all your pointless busy-body nonsense mean?
It means that you, more than likely, have violated a Commandment against others if you have judged them on this issue.
YOU HAVE NO CLUE WHAT THE FACTS IN ANY CASE MIGHT BE!
Maybe they used the “Internal Forum” or the Conscience provisions in Church teaching.
Maybe they instead, or ALSO, eventually sought a formal, External Forum Decree of Nullity.
You do not know. You do not deserve to know. There is something wrong with you if you think it is your place to know such things, or to judge such matters.