I don't clearly understand what you are asking. Do you want us to tell you circumstances that have generated too much controversy? My answer to that would be that the idea of something being 'too much' is in the eye of the beholder so there is no such thing as too much controversy.
However, its true that there are numerous things blown out of proportion because of the controversy surrounding it. If I had to say what I consider too much controversy, i would say it would be in events that ruin individuals who did not deserve it. People make mistakes, and the world moves on, but if you make a mistake and receive public attention because of it, the world freezes.
Some things cannot be forgiven, but others can, so when controversy blinds people from seeing the difference I get upset. But of course, that is only what 'I' consider too much controversy.
I hope I haven't gone off on a tangent and missed the point of your post, I apologise if I did.