Ah here we go again, everyone’s favorite topic.
My kids have been frequent FCL/FCT and other lounge visitors and have behaved much better than many of the other guests. My kids don’t shout at their assistants through mobile phones, they remain polite to staff and they leave the lounges in a similar state to how they found them.
Not saying adults should be banned from the lounges as it is much more nuanced than that. It is about people’s behavior and that is valid for children as much as it is for adults.
You can’t blame parents who are going on holiday bringing their kids into the lounge. Maybe you can blame LH for not having enough capacity and at a stretch you could make a point that lounge access for family members should be restricted when lounges are at capacity. But mostly you can blame individual parents of misbehaving children and those of misbehaving adults as well, as pointless as it might be. Do not generalize and punish the well behaved families because of a few bad apples.