FFS. If children aren't taken to museums, galleries etc from an early age, how do you think those places will carry on when the children grow up? Or if they are taken, but find them totally boring because there is nothing for them to do? My grandchildren love the Horniman. If you want to go somewhere where no kids are allowed, maybe go somewhere else? Or if you don't like the behaviour you see, take it up with the parents? I have intervened in a screaming match between two kids in the cafe where the younger one was in danger of being pushed out of his high chair and the adult/s with them were nowhere to be seen. If you do nothing (eg report the butterfly grabbing to staff) how do you think the behaviour of some parents will change?