Imagine someone who you know is a defender of an idea, let's call it idea A.
Than one day, you see her defending the opposite idea, idea B, in a group that you know supports idea B. When you confront her, she just says that she changed her mind.
Than again, a few days later you catch her defending idea A again to a people who are pro-A. Again, when confronted, she says that she changed her mind back. In the following days, you see the same pattern of seeming to have changed her idea whenever it suits her.
So even though I know that she seems to be doing something ethically wrong, I can't put my finger on exactly what is wrong.
I imagine that there can't be a 'ethically allowed number of times for people to change their minds'. So, technically, she can say, that she changes her mind infinitely many times without doing anything ethically wrong.
So my question is this: is there something ethically wrong with this behavior? Just saying that 'she used to be a person who defended the opposite idea the other day and she is conflicting with her former self' seems like 'ad hominem' to me.
PS: I know I must have screwed up a lot of terminology here and I probably haven't phrased the question in the right way. I hope that it still makes sense to you.