I'm the last person to defend Karpeles' competency, but his internet alias has nothing to do with it.
Of course you shouldn't.
If you were to here him (well, me) you'd ask for my CV -- if not an interview also.
And if it was like "developed some random toy stuff" you wouldn't hire me to develop a money exchange playing with other people's millions of dollars.
And if you were to assess if you will put $10,000 in a financial online service made by me, my past work in the area, my general competence would be quite important.
Else, don't be surprised if you lost it all. The chances were way higher than if you had put that money in Citibank, you just ignored the signs.
And for me, not giving the impression I'm a 20-something script kiddie with a fancy handle would also be quite important. I mean, it might be prejudice, but "Ives, Rockefeller and Berstein" as a financial service just feels more secure than "$uper7eetMoneyMakah", "LuvFlamingoes" or "MagicalTux".
How do you feel about "Bear Stearns" or "Lehman Brothers"?
"he had been leading the core library development of Android while at Google".
And that he is just but one of the players at Square, including guys like a well known VC and Twitter's cofounder.
If "CrazyBobs" was an unknown in the industry guy and his CV was like "I have done some fun projects, like a PHP mailer" and he was the major person behind the company, no investor would have touched it with a barge pole.
And still, even 2 weeks ago, tons of people defended MtGox in HN threads, and said how it's a temporary glitch and they are very good exchange and such.
Even when it was pointed to them that it's a service build by a guy with no actual knowledge of exchanges and no prior experience at finance services whatsoever -- a mere PHP developer (not to knock the language) that had done nothing spectacular before (no Carmack, or Fitzpatrick or your favorite coder hero).
People trusted their money to a guy that literary calls himself "MagicalTux" -- which to me seems like investing to the hobo on the corner, people call Crazy Bob.