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Well, it seems that the issue is precisely whether it is unnecessary.
Interesting that the issue is spoken of here only in terms of its benefits/dangers to men. But in fact, the issue affects both women and men.
Gentlemen!
The penis does not live alone but finds its way into orifices where it brings much joy and, sometimes, trouble.
The problem is that an uncircumcised, unwashed penis is a vector for infection and repeated infections can be a cause of more serious problems for women and men.
Good hygiene can prevent most of these problems, but guys tend to be slobs, and so the risk of infection is higher for the uncircumcised than the circumcised penis.
So there's something to be said in favor of circumcision. Done shortly after birth, it is far less dangerous and heals much faster than done later in life. So, one must weight the pain of the initial procedure versus the pain of repeated infections later in life both for the man and his partner.
Some men report great loss of sensitivity as a result of circumcision. About this, I know little. 95% of the men I slept with were circumcised, and I did not notice any appreciable loss of sensitivity.
Joanna