All sorts of benefits. Just because this particular just cause has no chance of getting off the ground because no politician is willing to put themselves in the crosshairs of pretty much all Jews AND Muslims and a large amount of Christian hangers-on (religious liberty advocates), doesn't mean that other causes without such formidable impediments are somehow moot.
EDIT:
I think I was unclear. I am NOT defending circumcision, I don't think it's defensible. I was responding to the parent poster, specifically this:
> What is the benefit of all of the aggressive moralizing that goes on towards all kinds gender and sex causes at this point, and yet...
I was trying to say that just because we can't get anywhere in banning male circumcision, doesn't mean that "all kinds gender and sex causes..." have no benefit.