Are the reason why people are so shitty because of the lack of hardships?

When I talk to older people, they are more trusting and always seem satisfied with whatever they have. Nowadays, resources are abundant, and people still want more stuff—millionaires with ten or more cars. People betray each other. Few people trust each other.

Is it because older people went through world war II and suffered that they are so humble?

Are the reason why people are so shitty because of the lack of hardships?
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