Giving some more thought to solidarity, I'm compelled, for reasons of fairness, to think of reasons, beyond pure ego, of why people would sacrifice their brothers and sisters in a union for their own ambitions.

Systemic bigotry. Sadly, it does still exist today, homophobia, racism, and sexism are still rampant. The terms are couched a little nicer, and not as hostile, but it's still there.

This bigotry would not only require but would compel a person to step out and confront it on it's face.