I would disagree. This is one of the most accessible back country campsites in the entire province for a young family. If you don't want the risk of hearing a crying baby at night, then put in a bit more effort and go to Helm Creek, Taylor Meadows, Garibaldi Lake, etc.. since very few people could carry a young family to those locations. Or just put in some ear plugs. Where else should this family go? Bushwhack on crown land to a place where no one will see them?
I err on the side of not taking away from others' experiences. I'm not surprised to be in the minority, because people here have previously said that it's totally cool to bring a crying baby into a backcountry hut, but I think some thinking of others is reasonable. When I go places, I think about my impact, and reducing it, and don't just assume that I should feel free to cause problems and leave it up to other people to have to solve for themselves.
Crown land sounds like a good plan. Or a campground with really widely spaced tent pads where you can have some more privacy. Or just sticking to day hiking until a kid reliably sleeps through the night and you can reasonably predict that they won't wake other campers with piercing cries.
I think it's great to see kids in the woods and I might well agree that it would be problematic to be bothered by a kid enjoying nature, but it's pretty normal and reasonable to be bothered if you are woken up by crying babies at night.
I wouldn't be at all concerned about kids having fun in the day, but if you're a person who can't sleep without making enough noise to wake others (and a young baby generally falls into this category), you're being wilfully rude to decide to ignore everyone else's comfort in favour of what you want when you decide to sleep close to others. Same goes for horrible snorers, late-night rowdy drunks, and night-barking dogs.