Teenagers rebel. It is quite possibly programmed genetically into humanity. There is probably some evolutionary reason for it.
But by the age of 21 most people should grow out of it. Sooner or later we have to grow up. Or at least we should.
Have you noticed how lefties are sometimes inordinately fond of animals, even to the point of wanting to prevent medical research which would save human lives? That too is a symptom of the failure to grow up. Children love animals. As the saying goes,
Men love women,
Women love children
Children love hamsters
(Hamsters don't love anything).