User blog comment:EvilLamp/Nedry/@comment-26205772-20160208022244/@comment-2059440-20160208025059

plus as I mentioned before the fact he made it near impossible to undo his actions is akin to cutting the brakes on a car or locking someone in a cage with a wild animal.. sure, you didn't kill them but you as good as sealed their fates.

Nedry (despite some users claims) was no dimwit and thus he knew fine well that stealing was wrong, the fact he made a fail-safe specifically to keep the park from putting security back is a sure sign he was well aware of everything he was doing and did not want to risk capture, even if it meant endangering other people's lives in the process.