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I'm pretty sure the point Roth was making is that he understands what kind of "business" Michael, Moe, and him are all in. The thing that he was angry about was not that Moe Green was killed, but why.
"Michael, when you killed my protégé I let that go because this is business but when you killed my friend it really hurt but I knew this is how things are because I really miss my brother he was a good kid that didn't do anything wrong and all I ask is you compensate for my loss, Michael. Just like how your father would because I knew him well."