Because it's more acceptable to kill a foreigner than a fellow countrymen?
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I'd go with coolmike's reason. Though I personally respect individuals rather than any organisation they belong to as a whole. I feel that a lot of the hate the police get is totally unwarranted. Though that said, I'm not a massive fan of some procedures the UK police follow. When I see 3 men needed to restrain a 16 year old, I see something wrong.