As a general rule, I try not to lie to myself. I wasn't referring to the social convention of picking a side to cheer for, but the internal conflict that occurs when you love someone and they turn around and hurt you; for instance, your SO makes a huge mistake, but you're reluctant to let that outweigh all of the good qualities that they have. It then turns into a situation where you have to determine where exactly that moral event horizon lies that then makes them unsuitable as your partner. (If anybody has an algorithm for this, please, help me out!)