SWAT raids are dangerous, and things often go wrong. People may shoot at the police if they mistake the cops for ordinary criminals and pick up guns to defend their homes against invasion. Sometimes cops kill the frightened homeowner who raises a gun.

Policing America   John Stossel | Jul  2014 

I want the police to be better armed than the bad guys, but what exactly does that mean today?
     Apparently it means the Pentagon and Department of Homeland Security equip even the tiniest rural police departments with massive military vehicles, body armor and grenade launchers. The equipment is surplus from the long wars we fought in Iraq and Afghanistan.
    To a hammer, everything resembles a nail. SWAT (Special Weapons and Tactics) teams were once used only in emergencies such as riots or robberies where hostages were taken. But today there are more than 50,000 "no-knock raids" a year.
    It's not because crime got worse. There is less crime today. Crime peaked around 1990 and is now at a 40-year low. But as politicians keep passing new criminal laws, police find new reasons to deploy their heavy equipment.
    Washington Post reporter Radley Balko points out that they've used SWAT teams to raid such threatening haunts as truck stops with video poker machines, unlicensed barber shops and a frat house where underage drinking was reported.             
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