Down voting your comment would disappoint me very much (and as of this writing, it's the top comment). IMO, at worst Amazon is part of a much larger picture. And as you imply, out of X number of people, Y will hurl themselves off a building. Remember the FoxConn hoo-ha a few years back? Yeah, I sat down and compared the reported suicide rates of 400K FoxConn employees versus China in general (I wasn't the only one, as I recall). Turns out, FoxConn folk must be pretty damned happy, actually, as their suicide rate was lower than the general population of China.
No, to place blame on Amazon is to ignore the problem. I've worked at far shittier places than Amazon is reported to be, and I didn't take my own life. More was at play than just where this person worked. If we need do anything, we need identify that "more" and fix that.