I think it is more arrogant to assume your intelligence were due to your hard work and everyone else just being too lazy to achieve the same things.
>Twin studies of adult individuals have found a heritability of IQ between 57% and 73% with the most recent studies showing heritability for IQ as high as 80% and 86%.
"Some have gone further, and used height as an example in order to argue that "even highly heritable traits can be strongly manipulated by the environment, so heritability has little if anything to do with controllability.""
Regardless of this, this is a measure if IQ, they control for a similar environment but they don't control for similar upbringing and individual's interests and pursuits.
IQ isn't static, there maybe a static ceiling that differs between individuals but the choices made by parents,individuals and environment affect how much developmental effort is focused on specific IQ traits.
As Einstein put it,you shouldn't measure a fish on it's ability to climb a tree.
Couldn't the same be said about intelligence?