There is a reason why we do not charge Soldiers with murder when we tell them to go fight for us. It is the same reason we don't charge weapon makers for the deeds there weapons/tools are used for. In the first case, the responsibility lies with the people who elected that government that gave the order. Not the Soldiers following legal/moral orders. In the second the same applies, the tool maker can not be responsible for the actions of the tool user, that falls on the tool user no where else.
In the case of the person in the article, he just got screwed over by the government, by lawyers shifting the personal responsibility to the tool maker instead of the tool user.