Yes, those were good angels, and referred to as sons of God. My point is that I find it difficult to believe evil, fallen angels would also be referred to as "the sons of God". Are evil fallen angels really sons of God?
Even if they are fallen angels they were bene elohim at 1 time weren’t they. Further—have you ever considered that this is the event that caused this particular group of angels to fall. Thus, bene elohim would be appropriate if its describing holy angels who fell at this time. But in reality bene elohim really has nothing to do with holiness but direct creation by God (ie no parents) & mighty power.