When it comes to tabloid photographers and celebrity photographers (think Paparazzi), in regards to someone's personal privacy, just how much intrusion is too much intrusion?

Considering things like chasing vehicles for a shot, climbing walls of private property to take pictures in sheltered yards or in windows, risking physical confrontations in public places, is it really worth it for photographers to go through all that trouble along with them disrespecting and irritating people in the process?

Are some photographs really that necessary or important? Does anyone have any opinions or stories or theories on any of this that they would like to share?