That change can't happen overnight.

It could. It would take one person to see things differently (and more logically and more, even, to his own advantage).

I tend to back Leon Rosselson's view :

That's not the way it's got to be

over John Tams:

Nothing changes it all stays the same.

Because the law isn't justice but morality is right and the biggest, indeed the only, sin is ignorance.