It is on TV, so it has to be the truth, right??
I am former SWAT, too old, and brokedick these days to do it anymore. SWAT has evolved dramatically from where it was 18 years ago when I first was on. Green light was thought to be the way to go, no patience, no talking. After a number of hostages got killed, the thinking swung to, talk, and talk some more. The green light is a final option. SWAT sets up, and the hostage negotiators go to work trying to peacefully resolve the issue. SWAT shootings are actually very uncommon. It is like any other law enforcement mission, 99% sheer boredom, followed by 1% terror.
A well trained, coordinated, diciplined team is a great asset. The "cowboy" or hotdog image is a rapidly, thankfully, fading thing of the past. Quite professionalism, patience, are the norm these days. (yep, I know some teams screw the pooch, but that is not the norm thankfully)