Folks, the only way to stop being angry about stolen photos is to not put them on-line in the first place.
One of the most amazing experiences I have had is someone sending me a photo of an ancestor born in the 1780s. She died in the 1860s and the family was wealthy enough to have a photo taken before she died.
I would never put this photo on my online tree (even though it is out of copyright) because I know it would be copied in an instant as there are two groups of people who have incorporated this ancestor of mine into their own trees quite erroneously. Some of them are adamant she is their ancestor even though I have tried to demonstrate they are wrong. Imagine what they would do if there was a photo on the internet.
I also have a photo, which I took, of a portrait of someone born in the 1600s. I don't own the portrait (which is in private hands) but I do own the copyright on the photograph. I would never send a copy of the photo to anyone without making it clear that I own the copyright of the photo and that it should not be put on the internet.
If somebody is willing to put a photograph they have inherited, which is out of copyright, then it is in the public domain, and they really cannot complain if it is copied, (or "stolen").
Venelow
Canada