How did a company like Theranos get so "far" with all signs early and present pointing to deep, fundamental problems? I refuse to believe investors simply failed to perform due diligence.
If you've ever invested in something and found out you were about to lose it, part of you flirts with the idea of selling while you still have plausible deniability. You know that if you ask too many questions, you'll lose that plausible deniability. Of course it doesn't really make a difference, you know damn well, but it's part of the grieving process.