Who? Not an individual, but the rest of the civilized world.
We've collectively decided to maintain those sites for a purpose. We've also collectively decided what does and does not constitute disrespectful behavior at those sites.
You're upset that you can't do whatever you want, wherever you want, without facing social consequences for your actions. You hear this sort of nonsense from school kids trying to defend their poor behavioral choices.
You wouldn't send text messages in a movie theater, would you? Then don't play video games at Dachau!