Many times I dive Nubble as an independent diver - I do not consider myself a solo diver - that term seems to be taking on a sterotype/classification with a set of necessary skills, experience, knowledge and additional equipment [redundancy, etc.] One of the reasons I have gone there alone since day 1 of my "diving career" is that there are usually tourists, locals or other divers there that are within ear shout, whistle, etc. if I get in trouble. Sure -they probably can't jump in and help me but they can summon help or at least tell the authorities where my body was last seen. Other people being there is a big factor in my "risk analysis" when I get to the site. Several times I have called the dive because there was no one there - but at the Nubble, this is a rare occurrence! Nubble can be treacherous at times, it's a big judgement call. I wouldn't call divers that go there alone and fall down stupid, but I would say they may have used poor judgement on diving there that day at extreme low tide under extremely slippery conditions, buddy or no buddy.