Generally, you get 3 strikes, and if you keep doing evil stuff after the third time you get put to the sword. This is the hordes 4-5th time they revert to their evil ways.
It’s not just sylvanas, it wasn’t just garrosh, it wasn’t just the demons, it’s YOU horde, you choose to let these things propagate as a excuse to do evil things.
It’s time the horde accounted for it’s crimes. What crimes you might ask? Millions.