"Is that all?" Slytherin seems angry. "That was everything! Allowing Muggle-borns was a risk to everyone's safety, and marrying Muggles risked it even more – an odd child might be played off as a genetic defect or anomaly, but both a parent and a child?" He scoffed, derisive. "Helga and Godric were fools and had no idea what they were asking for, allowing Muggle-borns into the school without taking the proper precautions."