I'd also like to add these videos for consideration, they are rare ccurrences in America and they are caused by a number of different factors, I'm not blaming the police, but they do make a strong argument for why police shouldn't have lethal force options.
In this video you see police fire into a parked car killing the driver and wounding four innocents standing nearby. They then threaten to shoot the man recording it on his phone.
http://english.aljazeera.net/indepth/features/2011/06/201162114131825860.html
In this video you see a police officer shoot a hard-of-hearing man who was making a wood carving with a knife. Now the police officer felt threatened so he shot, but if he'd had a tazer that innocent man might have still been alive.
In this video you see police fire into a parked car killing the driver and wounding four innocents standing nearby. They then threaten to shoot the man recording it on his phone.
http://english.aljazeera.net/indepth/features/2011/06/201162114131825860.html
In this video you see a police officer shoot a hard-of-hearing man who was making a wood carving with a knife. Now the police officer felt threatened so he shot, but if he'd had a tazer that innocent man might have still been alive.