Hi!
Here is the answer by BBs:
Users host their images (logos) on various servers, some of them can be marked as potentially dangerous. You can easily see which ones are the problem and contact the users about it (so they would use another server), but we can't build a filter for the sites since we don't know which sites are marked as potentially dangerous.
So I think thay some american guy causes the problem ;)
If you find who - send him the message asking to change the server of his logo.