That's not to mention the 300+ earthquakes above 5.0 they've had since the big one (I think the biggest was 6. something in the past couple days).
Even if all the faults Irbis highlights are true, Japanese buildings can withstand earthquakes.
It's still unfair on the workers who stayed though. Remonstrate the company all you like, but it's unfair to detract from they've done.
I'll also highlight that I said 'all reports currently indicate that everything was done by the book'. Since you've obviously have had updated information, my comment will be revised.