@Mahatma Kote
Re. Use of a PC secure deletion tool being a "red flag": That would be an old policeman's attitude - "what do you have to hide". I'd suggest that in these days of online privacy concerns, more people than you might think use such tools.
Should they all be suspected of illicit activity? No.
The flight simulator is an odd sidelight in this sad episode. As usual, evidence from the aircraft will tell the tale.