How is closing a toddler's bedroom door at night wrong?

There is nothing wrong with it. I am sure that their room is safe and I have yet to see a door that is sound proof from a childs cries. I honestly think it is safer then letting them wonder the house or even sneak out when you are busy doing something else. It is nearly impossible to watch a child every second of the day and this could help keep them contained in their own little safe area while you sleep at night or cook a meal or do a chore. I have 4 kids and they are all in bed at night, in their own beds, lights off, door shut and they are all safe, happy and healthy. Do whats right for your house, if you arent putting your children in harm, it is noone elses business! Good luck!