Back in the 1980s, I had a zipper break on a piece of luggage just as I got to the airport. Security in those days was minimal. I just lifted the bag with the broken zipper on the belt, got it out the other side, then went to a luggage store airside to buy a new bag.
The luggage store took care of disposing my old, beat-up bag.
By security risks, I meant buying a new case, transferring the contents of your old case into it and then leaving the battered old case next to a bin.
Someone would then see this case / bag, think "Abandoned case.....bomb!!!", airport would be sealed off, case blown up etc.
You could leave it next to the trash can, unzipped and wide open so as to indicate there is nothing in it.