What causes social cohesion?
You, (OP), have a healthy idea of a norm, where humans are part of a group, after being born into it. Members of the group accept its general beliefs, adopt its mannerisms, identify with it and glorify it without objective reasons to do so. Social instinct, bias, impressionability and herd mentality in humans are pronounced enough to make it hard, almost impossible for a group to fail at projecting cohesion within itself. It begs the question how dysfunctional society, or a group, must be for it to reach a point where all the above feels non-existent or irrelevant to individual members.
I believe this is that 'cause' you're asking about.
Not everyone experiencing this will wish or even decide to innawoods and wizard. Once those things are gone, that normally make the individual consider those ideas absurd and make the chance of anyone seriously considering that virtually zero, the disillusioned individual might find all sorts of formerly unthinkable delineations equally appealing, after all the group has lost its appeal. It is then merely a question of the individuals character, experiences liking and means how their alternative to life in the group might look like. Some remain shut in at home. Others are out and about but at best superficially interact. Others again seek the distance, or their demise. Drugs and what not.
The question should be: Why do people not choose their group and it's traditions, when people are programmed to exactly that?
Also
>>>/pol/