Alright. Then imagine I am a kitchen knife manufacturer. I make a kitchen knife and sold it. Someone uses that knife to murder someone. Am I responsible for the murder? Because I just reduced the argument you've been making this entire time, except I removed the engineering part from it.

I make programs. I make them according to a specification, which is defined by the client AND the management. After I make the program, it's out of my hands how the fuck it is handled. If one of those two parties use or modify the program in ways they didn't tell me, and which eventually result in disaster, because they didn't fucking tell me that they wanted to use it for those actions and I couldn't possibly predict it, should I be blamed when the program fails? Normal glass bottles weren't made to hold lava, why should I be blamed when someone uses the bottle to hold lava and ends up melting their hands?