Do you think its True that a person can only see Evil in others if they have some knowledge and experience of it in themselves?

I don’t know if i agree with it or not,........ i tend not to see Evil in people, i always look for the Good in everyone….. this has made me be taken advantage of quite a few times though so i have been on the receiving end of what id imagine to be Evil, so i think everyone must have some kind of idea as to what Evil is weather they are Good or Bad

Thought and opinions?