Betraying Mordin is the absolute worst thing in the whole game next to stopping Legion from uploading the code. Never will I ever have the heart to do this.
As horrible as it is, I have to admit, the way Mordin says “I made a mistake!” gives me chills. You can hear the conviction in his voice, the pain that mulling over the Genophage has given him. Sure, at the time, the Genophage was the right thing to do, but now that he has been trying to save the female Krogans from Maelon’s experiments he’s gotten a good look into the after effects of the genophage and he’s ashamed. He helped destroy a once thriving culture and turned them into something completely different and violent.
Curing the Genophage, sacrificing himself to make sure it works, is the final step in correcting a mistake he made years ago. And when you step in his way, threaten his redemption, he goes into a bit of a panicy state.
Even in ME2, Mordin spoke fast. His voice was light, airy and generally warm. Even when you confront Maelon with him, his voice stays calm and collected, even as he threatens to kill his friend. But, right here, right when you threaten to stop him from correcting his mistake, his voice booms! And he is angry!
On my boyfriend’s PT he shot Mordin in the back. He thought he needed the Salarian fleet, but he said it was the hardest decision he has ever made. He had feels, and he, even more than me, never has feels. Truly this moment is one of the greatest in video game history. I’m still having feels about it, and I couldn’t betray Mordin…