Do designers have a responsibility to do good? 

Yes and no.  I think the ability to create and the exercise of creating is positive, no matter what it is, because creating is what propels us into new realms of living.  The ability to imagine and then make what before was just fantasy, is beautiful.  If we continue to imagine and create worlds based on that imaginative thinking, we will continue to grow as a collective species.

 

This is not to dismiss the issue with designing destructive products; there are obvious concerns with 3D printing a gun or even on a greater level- making the atomic bomb.  While it would be great if people chose only to design positively, the issue is not with the way people design, but with the way people think, and the power and profit that go to ideas that are negative towards the earth and other humans.  Censoring ideas will do nothing but circulate more negativity and the real solution would be to foster environments and spaces that invite positivity and beauty as opposed to fantasizing destructive apparatuses.