What do you think of these two advice columns regarding non-monogamous relationships?

I recently came across two advice columns that addressed non-monogamous relationships in a way I found surprising.

The first column involved a couple who were friends with another couple. The latter decided to (apparently) include a third person in the relationship, and the former thought this was disgusting and didn’t want to spend time with them anymore. The advice columnist, Carolyn Hax, wasn’t sure how to advise them and turned the question over to the readers.

In the second column, a man’s ex-wife was remarrying, and it turned out the man she was marrying was a polygamist with multiple wives and children with all of them. The writer was deeply concerned about his children living in a polygamous household, and the advice columnist suggested he contact the courts to try to get full custody, and went on to say that “bringing your kids to live in a polygamist community is wrong. Totally, utterly wrong.”

What do you think about these two situations?