I believe if you have a margin account, then your shares can be screwed with no matter what. With a cash acc like a roth they can't be begged, borrowed or stolen.
Most of mine are in a Roth. Can't take out the cash until 59 but that's just a few years away for me.
I'm either going to be sipping Mai Tais on the beach or
suck'n soup living in a van down by the river.