They do that occasionally, and are universally condemned for it. Remember Israel is not allowed to defend itself. They have to just accept 100's or rockets a day lobbed at them and not react. If they do fire back, and go as far as to warn the targets, Hamas gathers their children and brings them to the target creating mini-martyr's and generating huge sympathy, especially from the west.
They have a standing offer: it Hamas stops the rockets, they stop theirs. Not difficult, unless your Hamas
Regarding Hamas bringing children to the buildings designated for destruction: you should realize that their values are different than yours and mine. We value life, they value heaven. If someone is killed in war, then themselves and 300 of their family are guaranteed a place in heaven:
Some people like to laugh and say that 72 virgins are waiting for them. That's ridicule, but not far from the truth depending on whose writing you are reading, but it is not in the Koran.
So yes, they do invite neighbours and children when a building has been marked (and warned) for destruction. But that is not cause for ridicule but rather a difference in values between them and you and me.