The Silmarillion is like fifty percent t Christopher Tolkien piecing things together. The guy changed his mind a few times regarding orcs and became more sympathetic to them each time but to work that in Christopher would have to change a lot of the silmarilliom to match. In lord of the rings itself (the books) You do get examples of orcs talking among themselves and they are intelligent, have independent goals and ideas and different cultures based on where they come from. The orcs guarding Cirith Ungol talk about how they hate their boss and would rather be back in the mountains just being normal bandits.