Here in the UK, the problem isn't necessarily the amount of police (although this is becoming more of an issue) but rather poor, aggressive, and violent policing that is unaccountable and out of control. Black and Asian men are 30 times more likely to be stopped and searched without due reason, and young men, especially in inner cities, often feel harassed and disrespected.
Police misconduct is investigated by police officers themselves - so investigations are not impartial, thorough or fair.
Anti-terror legislation is often used to justify draconian measures which work against our freedom, liberty and common sense.
Sad to say, also, police have recently killed men, without adequate explanation, in dubious circumstances and with little remorse or accountability. We need root and branch change here in the UK.