I know what you mean, guys. My father/perp and I look a lot like him. I see his putrid mug in the mirror first thing in the morning and last thing at night. My stomach turns a bit. I keep reminding myself that it's the character that is the person: not the visual image.
I have been estranged from him for 8 years and yet I still get a bit of a heart rate increase when I see someone who resembles him. I try to anchor my thoughts in how sorry I feel for someone who resembles the perverted monster who was my father.