In the Catholic view, why did the Devil and his angels rebel?

As stated above. I know the out-of-pocket answer is "pride", but I'm curious. The angels all had full knowledge of the choice and the resultant consequences, yet a third rebelled. Was it exclusively pride that led them to this decision, or something else? It seems a remarkably unwise decision for a being that knows unequivocally that it will result in eternal torment and separation from God. We can make the obvious argument that this is an awful lot like us, but the angels all had far more information than us. Angels don't need faith, they've all personally met God and know who He is without any doubt. They're timeless and never experienced moments of weakness. They made the decision in utterly ideal circumstances. Was it truly pride and pride alone that led to this?