The analogy here is more akin to a booby trap than a gun, in which case we do assign the blame to the person that made the contraption intended to harm the unwitting user.
That aside, considering once it was discovered how the drive wiper that OP (aaza) claims to have made works, it basically just became a drive wiper that any bad actor could drop into a target system and run, “I intentionally distributed malware that I think, but have no way of verifying, only hurt The Wrong Sort Of People” isn’t just illegal and wrong, it’s stupid.
Imagine copying an entire binary onto a system just so you don't have to run `cat /dev/zero > /dev/sda`
Imagining script kiddies using stupid software in stupid ways very clearly and easily, also imagining a script kiddie pasting `cat /dev/zero > /dev/sda` into the windows command prompt of the computer he’s controlling with sub7 and getting very frustrated
Second, we assign blame to the person that pulls the trigger, not the maker of the gun.
Third, these people are likely to never face any other form of punishment.
Personally, I think these facts justify this level of retribution. That doesn’t make it “legal” or “right”, but I definitely do not think it is “wrong”.