Human nature is self-interested and negligent of others. We tend to do the least work possible for the maximum perceived benefit.
Q: Why would anyone work harder than they need to, especially when their neighbor shares in the overall gain?
A: In a word… Leadership. The only way to be a leader is to lead by example.
As children we are dependent. Eventually, as we mature, we learn to take care of ourselves. We develop personality and character. We learn to interact with others and establish our place within our respective communities. We learn that we are not alone, and for better or worse that our actions affect others.
Just because a habit is in one's nature does not mean that person is a slave to the behavior. I believe as adults we have the ability to choose which environment we can surround ourselves in and thereby change the nature of behavioral pathways. This practice takes discipline, maturity, and mastery of oneself.
There is an old Proverb "Iron sharpens Iron, as Man sharpens Man"... which I believe refers to One's ability to influence their environment where the more Dominant force will prevail.