Id also highlight the basic factors of quantiy and consequence.
There are far too many elders to effectively spook the entire herd by picking off one or two or even twenty. You would have to hurt a thousand thousand to make a sizable enough impression on the whole group and there simply are not enough cases to male that sort of impression on the elder herd as a whole.
On the other hand there are far far fewer GB members. Picking one or two of them and making them the focus of legal action could make an impression