I headcannon that at least one of the witnesses chewed out Edward and Bella for their parenting "method", how much they loooooovvvvvveeeeeee each other etc etc
I think that’s a definite possibility. But, as awkward and uncomfortable as this kind of confrontation might be, I feel like the majority of the Cullens’ witnesses–and even the Quileutes– will just politely fade away.
Realistically, how many times can the Cullens ask their allies to put their lives on the line for Edward, Bella, and Nessie? As you imply, there’s nothing about the Swan-Masen family that’s particularly admirable, and you can’t really build an ideological argument from their situation. This is especially true once the Volturi put forward a legal reason for banning hybrids. It’s hard to counterbalance the carnage caused by vampires trying to reproduce with stories about how cute Nessie is.
So, the next time the Cullens call for aid, their witnesses might just say, “Thanks, but no thanks.” It might not be Mary or Senna or Peter’s style to berate Bella and Edward for neglecting their daughter–they all seem like rather quiet characters– but distancing themselves from that whole mess is a very real possibility.