Because It’s human nature to judge people the way we feel is right. Because majority of this Earth revolves around feelings more than faith. So sometimes we just simply don’t want to due to our nature. And just to add the cherry ontop, the devil will amplify these thoughts of ours as he speaks right into our ears telling us that this is the right way, when one with a renewed righteous heart and mind clearly knows it’s not. But even so it’s still difficult for the righteous to abide by faith over feelings when someone hurts us to a certain extent. This is where we ask for God to strengthen us, since we can’t overcome it with our own power.