yes, it has a specific "cause", but it's one that I think any Aes Sedai would be comfortable committing to on some level.

I think it's more of a fall back than the Blue or the Red because you don't have to have your OWN cause, you don't have to worry about politics as much (like a blue) and, even if many Aes Sedai could find a place with the reds, you're unlikely to sit very highly on their "good Aes Sedai" list unless you're a spazzy ruthless man-hater as well