In plain English: “Its good to have allies.”
This can be taken several ways, but I think your meaning here is that a path forward lies in convincing these people of the error of past legal opinion.
Well sure. Just give me many billions of dollars worth of existing media infrastructure, total control of schools, especially law schools, and we will get right on that project.
In human history, often times some ideas become so heavily entrenched in people's minds, that they cannot be dislodged easily or quickly.
Slavery, for example. Look how long it took to convince people that it was bad.