That mindset about "everyone deep down wanting what they think is best for the world" is a baby brained attitude you must grow out of.
At the very least, because it isn't true. But more importantly, because it doesn't matter.
I imagine lib girl doesn't feel this way about the unarmed people the cops shoot in the street. Were they all bad people on the inside?
There's no way to convince someone out of this, it's literally a form of immaturity. They have to see evil directly in front of them to truly understand.