While this is a powerful speech, knowing the context of the Diablo IV trailer they used as the background footage makes it kind of funny. The Angel you see is a fallen Angel for his transgressions in the lore of the video game series Diablo. He fell after leaving Heaven to marry the daughter of Diablo, and their children would go onto become Humanity. He goes to hell to fight Diablo and banish his wife, not to save mankind, but to save his own skin. He's a literal crybaby bitch who uses his stature to use mankind as pawns in his own pursuit of defeating Diablo to seek favor with Heaven again and return home. He is literally willing to let humanity, his own children and devout followers, burn if it means he can go home. To top it off, he dies at the end of this trailer to his Wife in the most pathetic way possible.

So, using that footage with the speech is funny since the game is very sacrilegious and not at all portraying what people think it is.