... many humans, alas, if they make a horrible mistake but nobody saw it, will have a very strong impulse to disappear. It's cowardly... but it's human. It's one of the reasons that in some parts of our culture, we're taught often how cowardlly it is so we can resist that natural urge... but it's not as common these days.
It can also be a miscreant, somebody who's already illegal, somebody oblivious...