This is an O'Reilly clip with John Stossel from August, on police raids, where I'm actually closer to Stossel's opinion on the subject.

But the statistics O'Reilly cites are devastating, that over 500 police officers a year are killed, and about 500,000 injured annually, many so severely that they can't return to work. (As compared with about 350 police shootings of suspects annually, only 150 of which are black suspects, the majority of which are unquestionably justified. Out of 7 million annual arrests.)
It gives justification to why police often use force when they debatably don't have to. Taking firm control of a situation can prevent them from being killed or severely injured.