Paparazzi are scum. I don't envy that part of celebrity lives but they dang well knew it came with the territory. They seek fame and fortune, and they must take the negatives that come with it. They don't like it, get off the radar screen.
Britney Spears has obviously suffered a breakdown, probaby precipitated by some sort of addiction. It doesn't help that she was thrust into fame way to young, taken advantage of buy money hungry parasites. Of course, being a not very intelligent person hasn't helped her either.