Why do most teens to middle adult hood hate cops?

Recently, I was watching a video on Myspace. The video showed a cop almost getting hit with a car. I scrolled down as I usually do to check out the comments expecting a lot of comments saying that pig should of died I responded with why do you guys hate cops? They protect you and they treat you with respect I got various derogatory comments about my Asian descent in retaliation for my views on cops. I've also received you pansy, why do you cry to the cops and hope they protect you from the bad guys but with more 9th grade language (cursing). I'm just wondering why people hate cops so much. Without cops, or any law enforcement for that matter, we would get robbed and killed without any ramifications.