I mean when you think about it in the grand scheme of things luggage isn't secure anyway, you can just cut through the fabric and other materials if you're so inclined to steal someones belongings from their luggage.
That's true, but at least you'd have some evidence of tampering. If it's your data that is breached or your privacy invaded, you have no idea.
You can also just push a pen through the zipper to open it without leaving any evidence. Simply run both locked-together sliders back over the zipper to close it.