Society ROUTINELY throws minorities under the bus because we have simply accepted that a small inconvenience for a majority could not possibly be worth paying if it helps a few people a lot. I think the cultural sentiment you're talking about is really just "agree with everyone else, or else risk exclusion" - the usual extortion. The same reasoning can justify much worse things. Humans are very social and children are partly raised by the society around them - people deny it because they don't want to have to change.
Just to be clear, I'm really against this because the parent said he can keep his child still, but its not the child's natural state. And you go and call him a "bad parent" for not stifling his kid. Bullshit.