Read the damn report before blowing off
Don Jefe's post is complete and 100% bullshit.
If you had actually read the actual report (which is very interesting reading)
http://www.nasa.gov/sites/default/files/files/Suit_Water_Intrusion_Mishap_Investigation_Report.pdf
then you discover that they tracked down all the variables and determined the many things that went into the problem. It's nothing statistical. It's "this happened, that happened, someone did this, and boom" and we have the records of it all.
NASA does this sort of fault analysis all the time. Heck, they do fault analysis BEFORE they build/launch anything to get a grip on the scope of possible problems and how difficult the solutions would be. It's originally borrowed from the processes the USAF used to discover why they now have a smoking crater instead of an airplane.
You'll also discover that the investigators check how many times the drink bags have leaked, and the number has been zero, except for minor droplets when the mouth valve is bumped. As a matter of fact, they get a little annoyed at the number of times they were told this (many) and the number of times they were able to back it up (zero)
They did take the drink bag out afterward and squeeze it, and it didn't leak. You can't do that on an EVA though, because it's inside the suit.
The 1st problem is the suits are not designed for ISS. They were designed to go up in the Shuttle, do a couple EVAs, come back down and get cleaned up & maintained. They weren't designed to go more than 3 weeks w/o work.
How did they get approved for 6mo stays on ISS? "We don't have anything better" - wrong answer.
As a result, the ISS crew does what it can without the specialty tools & knowledge to really do a good job.
The next Dragon flight this month is carrying the first new suit to go up since the Shuttle.
Why was opening the purge valve a last resort? "We think it might damage the suit, we don't know, we've never actually tested it" - wrong answer.
Why was the CO2 sensor dying (because of the water, but they didn't know it) OK? "oh they do that all the time! it's not a problem!" - wrong answer.
The 2nd problem is that nobody knew what the water would do in zero-gee. They thought it would get blown by the fan onto the visor looking like rain on a windshield. They also thought the fan/sep would stall out because that's what it did on the ground. They thought it'd be a visibility problem, and that'd be it.
Instead, in zero-gee, the water collects at the outlet behind the head, then when you get enough, it capillaries onto his head and into his scalp, ears, eyes, nose, etc as it happened. This was a completely different outcome and threw the troubleshooting process out the window.
Mission control dicked around trying to do troubleshooting for too long, but they did finally realize "we don't know WTF is going on, we need to bring him back in"
The rest of the problems are mostly people, like nobody ever talks to the EVA office, therefore the EVA office doesn't talk to anybody else, and the normal organizational issues. One of the issues of course is that there's no funding for improved suits, and since the Shuttle ended, they've lost at least half their suit-experienced personnel. Another issue is you no longer train with flight hardware, so the training isn't completely realistic. People used to work with real suits, but now they only see flight hardware at a distance through a layer of bubblewrap.