The Hitchhiker was a real ingrate
I mean, people are generous enough to give this scruffy wanker a ride, and he doesn't even warn them about the circumstances of their impending doom?
Oh no! He saves that juicy tidbit for the audience. It's like, "Hey, you know that person who was kind enough to give me a ride just now? Oh, well they're about to DIE. And it's gonna be really, really ironic."
How about the irony of their generosity going unrewarded, as they are mocked by the very same transient they helped, you jackass?
What a terrible representative for hitchhikers. If you're ever broke down on a desert highway, trying to thumb a ride to no avail, you know who to blame.