Allow User to delete complete

i run a community with sensitive topics on relationships. my users want to be able to leave the group without a trace - meaning when they delete their acount, their intros, their posts and comments should be deleted. (just like with facebook).

at the moment it looks like people can deactivate their account but their posts etc remain in the group, including the uploaded picture.

this is very important for running a membership, people need control over their data!