So, who is to blame for this?
On one hand, life is full of things kids can get into that can destroy the “thing” or injure the child thus making it imperative that parents supervise their children. My mom’s questions, which I applied to my own children, were “Do you own it? Are you going to buy it? Then don’t touch what isn’t yours.” Respecting other people’s property should be a lesson taught and learned early.
On the other hand, art pieces that can be easily knocked over puts the responsibility on the museum to display the art in a way that minimizes the potential for accidents or museum guests getting a little too interactive with the art.