Please just stop. You clearly don't have a grasp on the issue,
Dude,
If logging out of iMessage/turningit off before getting risk of it is a rigmarole, then these users deserve the issue. common sense for a normal user is when he/she gets rid of a phone, he/she should reset the damn thing to remove personal stuffs in there.
BTW, If it's a bug, it should happen on every phone not just a few.