Even though I personally believe that with Gox there was at least serious misconduct or manipulation involved to some degree, he definitely deserves a fair trial - like everyone else. If your company fails, this doesn't necessarily mean you're guilty of something. Businesses (especially start-ups) fail every day. They have to dig and find out whether he was doing anything that was indeed illegal.
He surely deserves a trial, but if Japanese authorities don't think that he's committed any crimes he'll probably stay out of such procedures.
Japan's Yomiuri Shimbun newspaper wrote a story half a year ago that claimed the Japanese police believe 99% of the disappeared Bitcoins were due to an inside job, but they have not named a suspect. I doubt their lawyers will let the police name Karples before he has had a fair trial.
http://www.coindesk.com/missing-mt-gox-bitcoins-inside-job-japanese-police/The disappearance of 99% of the bitcoins missing from Mt Gox can be blamed on internal system manipulation and not any external attack, a major Japanese newspaper has claimed.
Citing an unnamed source connected to the ongoing police investigation, Japan's Yomiuri Shimbun newspaper led with the story on the front page of its New Year's Day edition. Only 7,000 BTC, or 1% of the total 650,000 missing, could be attributed to hacking attacks from outside the company, it said.
Yomiuri did not elaborate further on the matter.
That a company insider might have been responsible for the theft of 650,000 BTC from Mt Gox has been whispered about for some time, though no-one in particular has been named as a suspect, even unofficially.