The only danger that the Stowaways faced was from themselves, other PAX were not under any threat or was there any other safety issues to the PAX onboard.
Have you seen the damage that turbulance does to unseated people, and anything else not tied down?
He made a mistake, a big mistake. Something he'll probably regret, but can you at least put it into PERSPECTIVE.
But the loadsheet is incorrect. The crew have the wrong passenger number on board, on the flight plan, and contrary to what has been legally signed for. Sure the loadsheet is never exact, but this is a known error: the aircraft has more people than it is legally certified to carry, and the repercussions will and should be far-reaching.