Hopefully himself.
The must be something in the water…
But seriously, open up one of the driving videos and take a good look at where these idiots live: affluent, white, New England, semi-rural, minivan (and Land Rover and Volvo station wagon¹) suburbia. These kids have never suffered hardship or hunger or fear or any such distressing things. They haven't even had to do much hard thinking in their short, soft, self centered lives. They are the epitome of sheltered. So it's no wonder they try to fill their uneventful, meaningless lives with foolish fantasies and have no real concept of any consequences for their actions.
Now that's not to say everyone who lives there is also stupid, naïve, and selfish like what Jace is. Doubtless Jace and his adult créche mates are only a small percentage of the population. However the more sensible people in the environs are just that: sensible enough to avoid them. And without much interaction with normal, rational people is it any wonder the fools flock together?
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¹ No offense to any Volvo owners. They are fantastic vehicles. It's just that they are also very, very safe.