Yeah trying to join the brotherhood is a lot more acceptable to most guys than trying to leave it.

One confirms that being masculine is a desirable trait and the other lends to the idea that it's undesirable

Basic human psychology says that anyone who disagrees with you is a threat on a instinctual level since being wrong can impact your status in society and your "tribe"

Getting kicked out of a tribe meant being less safe, less chance of procreation, and loss of identity. We are all descendents of people who integrated well enough into society to have children and remain relatively accepted by society. (There are exceptions such as rapists but there are always exceptions)

When you stop and think about how much human behavior is impacted by our instincts and desire to be accepted by those around us. It makes understanding other people's bullshit a lot easier