Some grill, others prefer a quicker method for healing a meal

We humans smugly conclude that we're special and distinct because we fabricate and use tools. It seems to me that we have some things to learn about wise development and use of said tools. Recently I saw a video feature on 3 D printing. Early in the technology's ascendancy, someone is developing components for assault rifles. The developer seems to have no compunction about what might happen should everyone have increased access to a weapon. Like I say, maybe we have a lot to learn.