They’re just selfish. I don’t think it’s always keeping others from having something, it’s themselves not benefitting from it directly. They cannot understand logical complex systems more than a step or two removed from their direct line of sight. For example, public education provides so much more than just free education. Food, safe spaces after school, clubs, and the education itself all provide stability, reduction in crime, better health, all of which benefit society as a whole. But they can’t see that. They can’t conceive of the bicycle not stolen, the car not broken into, the kid who got a job instead of being homeless.