I really don't think someone who has a Flight Sim at home for sinister purposes would be broadcasting the fact, along with all the hardware that he's bought to put it together (sounds like he built his own -rather impressive - Gaming PC for this purpose), and more importantly using his own name.
He's obviously a really keen gamer and SIM'er, so people that keep harping on about this point really aren't doing themselves any favours.
Background chatter that can be turned down I think.
Let me ask a question of those who see the sim as completely innocent.
Suppose a plane disappeared under odd circumstances such as this one did. After the disappearance, it was found that the pilot had a very elaborate and expensive sim setup hidden in his basement which nobody knew about.
Then would you find it at least a little suspicious?