Some bitcoins are died because of the forgotten private keys or lost wallets, some of them died because their owner died and some of them will be never in the system because technicaly they are burned in the adresses like :

1BitcoinEaterAddressDontSendf59kuE
1CounterpartyXXXXXXXXXXXXXXXUWLpVr
1xxxxxxxxxxxxxxxxxxxxxxxxxy1kmdGr
1dot1xxxxx1sv1xxxxxxxxxxxxxwYqEEt
1See1xxxx1memo1xxxxxxxxxxxxxBuhPF
1BURNED4fBBJPNBUzytg6Q3HVj7uFGBxNE


Why people send bitcoins to the "burned" adresses? What is the philosophy behind it?