Lawyers do behave ethically. The key part is that they will make the best case they can for their client, even if he is a complete and utter crook. Of course, successful crooks tend to be able to afford better arguments.
It may be a very expensive job trying to make a silk purse out of a pig's ear, but that's just karma operating as it's supposed to. And the alternative, as seen in some countries with less than robust legal systems, is innocent passers by getting killed in crossfire.
Traditionally, industry bodies arise either to deal with an external threat, or because the members have got tired of fighting one another. I suspect in this case it's both.