You are absolutely judging them.
Perhaps you have many times when you feel absolutely amazing. However, for many, many people, there is no other time in their lives where they have a beautiful dress, perfect hair, perfect makeup, perfect nails, all their family and friends with them, all celebrating the fact that they are very much in love - and for many of those, that they are joined in the eyes of God/their deity/supernatural being of choice in a sacred rite.
They hadn't overspent, they took out some credit as people do for things like cars, kitchens, furniture, surgery, dental work, whatever, but it had not featured in their calculations that they'd then be in a position where they have nowhere to sleep and everything they worked for and owned going up in flames. They had enough and now they have nothing, not even the special dress that she was going to wear on the day of their wedding - or shoes, underwear, makeup, handbag, nothing for the other days, either.
It's not immoral to want to have more than the most basic, cheap stuff (because they're 'not worth anything better'?) for one day of their lives. It's human nature.
What would be immoral though, is to lock a fire exit in an unsafe building. Or to not maintain the fire alarms because they couldn't be bothered, didn't think the people living there were worth the cost of protecting, not getting round to removing flammable cladding for over SEVEN years after other perfectly ordinary families died in the most horrific way - or to concentrate upon how awful a victim is to get ideas above her station in wanting to have a special dress for a special occasion, instead of the awfulness of the situation the residents found themselves in through no fault of their own.