I'm not sure on that. Other than they are the scapegoat. And I guess that would be applicable for the first husband also.
Second wives are frequently looked on as the bad guys if they were catalyst for breakup.
I guess it depends on where someone is in the mix.
If I met a great guy but he was married I would tell him I wasn't interested in anyone married or involved.
But plenty of women out there who wouldn't care.They might even find it a challenge to get the guy away from the other women.