What is the end goal of software? The vast majority of engineers seem to believe the goal is for the software to be perfect, when actually it's to do things like catch cancer early or make money. Do you think a person who’s life was saved by software with footguns cares?
They are free to use them for themselves. But to use these apps on others can be life threathening in cases. And if not it's still unethical to sell such software when they are literally unable to describe what it can and cannot do.