because everything is subjective and the system works to a large degree on intimidation
I'm glad I don't live in the US. I can't answer the question either as speeding tickets don't really exist over here, I've never gotten one and probably never will.
I have about 2 speeding tickets a month, and lost my driving license twice for 2 weeks because of speeding, speed limits here are pretty low, so I don't know anybody that never had a few.