Parent's comment has got everything to do with yours: you are feeling like the software somehow owes you to be merchandable and fit , while the software's license explicitely rejects ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS .
There is a large disconnect here.
Nothing, as far as I can see. If someone writes some crappy security software and hides behind a licence that only means those relying on it have joined them in being irresponsible. Responsibility multiplies, it’s not zero-sum.