So what? This is as much of a stretch as the libscum saying Fred litigated for terrorists because his firm took the Lybian bombers as clients. Too remote to matter.
(Hint: Ad agencies have lots of clients. Some of them might even disagree about some stuff.)
One of the good things about the private sector, what is left of it, is that the owners of a business can decide what kind of clients they wish to represent. Ethical practitioners can draw the line on gambling, alcohold, all kinds of client categories. Same with the ads they produce -- the owners and management have control over what is proposed or sold to the client.
It's not just about the money, except for people with no ethics.