I wouldn't say the general population trust police officers. Being able to trust the police is a form of privilege that minorities, the poor, etc. often don't have. Most individuals from an upper-middle class background don't have reason to distrust the government.

The people on HN are probably an exception. I think perception of law enforcement depends largely on whether a person has found the authority figures in their life to be benevolent or malicious. Authority figures, especially law enforcement, tend to view those outside the norm with suspicion.