The only way you'll be able to delete it is if you physically visit them and physically remove your stuff from their PS3 console. The PSN Terms of Service states you aren't supposed to give out your email & password from the PSN, so don't expect Sony to help you out. The only thing you can do is change the password for your PSN account and wait for the "friends" to delete the account for you once they discover its now useless to them.
Credit card details are not stored on the console, by the way. They are stored on online servers like all your other PSN data is. And yes, the "friends" can make purchases with the card on file if they really wanted to, as long as the password stays the same.
PSN accounts can't be deleted and no you can't delete the accout off there PS3 all you can do is change the password.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.