I always thought they were something of a diminishing force, Prudie. Where they might once have been a secret organisation, they have, over the years, merely become secretive.
Not sure how much good they do within society for charity - I have never seen an analysis, so cannot comment on that, apart from the fairly basic observation that charity is generally a good thing but does have its faults.
There was, once upon a time, some entirely understandable concerns over the establishments connections to freemasons lodges - judges, police, lawyers, businessmen - and one can imagine that in such an environment, you might be tempted to do a favour for a friend.
Most of those fears seem to have been eased in recent years - Didn't it become mandatory that one had to declare your status wrt being a mason if you were in the police force, etc?