Be able to leave groups

As the title states, in the user CP, in the group memberships, you cannot leave groups. I feel as if you should be able to leave those groups if you do not want to be in them anymore.

If this is enstated i think there should be a multi step verification that you do want to leave just to make sure you dont leave on accident. Example: Do you want to leave So-and-So? Yes, then Yes, then Yes im sure, then alright hit ok to leave.