Any diver may call a dive at any time for any reason and that reason need not be given. Having said that if everyone was ok with proceeding including you there was no problem. Looking each one in the eye and getting their ok was good procedure. And what's wrong with only being able to see fin tips? Low vis dives are fun and great learning experiences! It may have been limited but you don't need to see the hairs on their chins man! As far as chop a little is not bad if it were 10 or 12 foot waves that's different. if you could see fin tips and bottom who needs lights. You stated at the beginning it was enjoyable and typical conditions. Everybody came back and nobody punched you out for going ahead with the dive. Don't worry about comments from those with limited experience or what seems to be by the book answers. Go with your comfort level and leave it at that.