I can't believe I just read that on a professional sign board.
There's no magic bullet on this. You can't say "The installer didn't build it to blueprint" or "the designer should have had detailed installation cross sections" because you have no idea or ability to foresee what the installer runs into in the real world, as built scenario. EVERYONE at that sign company will feel some sense of responsibility for this tragedy, not just designers, not just installers, I'm sure the whole company feels as if they killed a small child.
