What did the angels fight about in Diablo 3?

I'm playing Diablo 3, and it shows how Tyrael is like "yeah, I'm done, I'm going to go help the humans".

What were all the arch angels arguing about?

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2 Answers

If you paid attention to the clip, you will discover that Tyreal is arguing with the council about their refusal to get involved with the war between the Humans (descendants of the Nephalem), and the realms of Hell. Due to their (the human's) lineage, the Angels deem unfit for their assistance/protection from the realms of Hell.

Tyreal; as the Archangel of Justice feels the High Council is being unjust in their refusal, hence his choice to remove himself from the High Council.

Simply put, Tyreal knew of the dangers that were about to take place, and the other angels did not care.

Tyreal is known as the angel that sticks up for the humans. That said, the other angels are mostly shown to be unmoved by the events that befall sanctuary. When Tyreal finds out that the remaining Lesser Evils intend to invade Sanctuary, he means to help. But the other angels care very little for the humans, and in the end, heaven denied assistance.

You can read a more detailed analysis here. Bear in mind that Tyreal's background develops over both Diablo 2 and Diablo 3, so if you have not played Diablo 2, a lot of it might be confusing and/or spoilers.