Humans are idiots.
Most often because they are trying impress someone. And generally people are only trying to achieve an end, with little regard for others. Being selfish and conscientious about how ones' actions affect others is out of vogue.
My ex wife did/does that all the time, can't seem to see that it's herself vshe's talking about....
They don't want you to experience what they went through.
Sometimes I do stupid things just to see who'll copy me... it's good for a laugh