If you have lived beyond your means for a long time, you will eventually find yourself in a lot of trouble.
In the same way, if you have been extremely selfish for many years, you will eventually find yourself lonely and miserable. You may have saved up a lot of money, but what if there is nothing your children desire more than your death. Your employees may be polite to you, or even praise you for your business acumen, but no one loves you and if you look inside of yourself, you will find nothing but a wasteland.
If you drink too much or take too many drugs for years and years, you will eventually find yourself in the gutter. In the same way, a society that emits more toxic waste than nature can decompose will eventually be poisoned to death. This is very simple logic.
Some people are constant, habitual complainers. Absolutely everything is wrong and all people they meet are complete idiots. They often try to hide their feelings of disgust behind polite manners and smiles, but it shines through. It is not very pleasant to be around such people.
The question is, is it possible that mindsets like this can be changed? This is in fact the only question you have to consider. Is it possible?