I know what you mean.
This morning my wife and I had breakfast with a long time friend and his wife. When we came out of the restaurant he pulled me aside and asked me if I remembered so and so, I said I did, he told me so and so was just sentenced to 3years in prison for sexual assault on a 12 year old girl.
So and so has to be in his 70s and a very pleasant and helpful person. You never know do you? - Tom
Problem is you only know of someone what they want you to know.
All the rest is hidden.