I note that a company I worked for refused to have any GPL software on their machines, even GCC, due to legal advice. That was a couple of revisions of the GPL ago, but some scars last. By "some scars last", do you mean "I'll stay away from that company"? No, of course not. The key point was that we were a small company and would not have survived a law suit, win or lose.
I don't follow: the "keep away from GPL" stance seems to only make sense in the context of a very large corporation where the potential benefit of that one little tool (GHC) is dwarfed by the general risk of using things whose license can't be controlled via money. In the context of a small company, rather than a general stance, I'd expect it is worth looking at each specific case (since that one tool would likely represent a more significant portion of the overall set of tools in use), and drop the hysteria. Reality check: Has anyone ever heard of a company sued because they use a GPL'd tool? Ever? How 'bout in your wildest dream, maybe? Stefan