Thrall let them in (Hamuul argued for them, but it was Thrall's decision)
-Thrall helped Sylvanas reclaim her damn city since she's too fucking stupid to realize pet Dreadlords are a bad idea.
-Thrall kept Varian from raising a Blue Flag up above the Capital City Ruins
-Thrall allowed Sylvanas to keep her place in the Horde after it was apparent that the Forsaken weren't searching for a cure for their "condition" rather making plague.
-Thrall is an Orc, the Horde is an Orcish Organization
Thanks, but try again brewski.