There are the conditions for suicide, and then there's the impulse that drives it to happen. The first is visible and appears over a long period of time-- felony convictions, mental instability, or extreme career adversity-- but it never seems that things are that bad (especially because a lot of people refuse to admit that good things can happen to bad people). The second is fairly sudden and seems "random". This is why suicides are so unexpected. A person can seem to be "not that bad off" one day, and the next day, commit suicide.
The scary thing is that the first kind of conditions are being more common. We have:
* draconian sentences for minor crimes, including drug possession, white-hat hacking, and file sharing, * an increasing willingness of corporations to use extreme and illegal career adversity (e.g. blacklisting) against whistleblowers, * increasing difficulty for a person to "re-invent" him- or herself in the wake of a bad reputation.
Thirty years ago, if your life got fucked up, you could pull a Don Draper. You could pay people off to represent themselves as past employers and reconstruct your career under an alternate name, and move halfway across the country. (I don't consider this unethical in the context of radical reinvention, providing that you're not feigning competences you lack or defrauding people.) In 2013, that's becoming increasingly hard to do.