I believe you can have a grasp of the magnitude of it by thinking that people are the product of their birth (genes and whatever) and their experience. Certainly we can think of experience as very significative in the way people act and think. Also if you replace the word experience by education (see as being the same thing here), you end up with anything from study environment, to culture to politics that actually determine a lot how people behave.

That's actually my main criticism of the politics in my country. It's not so much that the politicians are saying dumb things, they actually are great people if you look closely. It's just that their politic is not how I would "educate" people, the way people experiences it is the bad part in my feeling.

In short, I think those impulses have a lot to do with experience/education.