My perspective in life is that I don't respect anyone, for any reason, unless they earn my respect. While there are several officers that I respect, I don't respect the majority of them. I've interacted with many law enforcement agencies, in many capacities. I've never been arrested, detained, etc. Most of my interaction with officers has been on a professional basis (such that their department is assisting mine, or mine is assisting them), and most of the officers I've had to interact with are such stuck up pricks that I'd rather have a root canal than interact with most.
I completely understand their purpose, but I am very, very strongly opposed to the way most law enforcement agencies operate.
I'll stop there before I get murdered.