Some anecdotes to illustrate.

"The officers with SWAT and dynamic-entry experience interviewed for this book say raids are orders of magnitude more intoxicating than anything else in police work. Ironically, many cops describe them with language usually used to describe the drugs the raids are conducted to confiscate. “Oh, it’s a huge rush,” Franklin says. “Those times when you do have to kick down a door, it’s just a big shot of adrenaline.” Downing agrees. “It’s a rush. And you have to be careful, because the raids themselves can be habit-forming.” Jamie Haase, a former special agent with Immigration and Customs Enforcement who went on multiple narcotics, money laundering, and human trafficking raids, says the thrill of the raid may factor into why narcotics cops just don’t consider less volatile means of serving search warrants. “The thing is, it’s so much safer to wait the suspect out,” he says. “Waiting people out is just so much better. You’ve done your investigation, so you know their routine. So you wait until the guy leaves, and you do a routine traffic stop and you arrest him. That’s the safest way to do it. But you have to understand that a lot of these cops are meatheads. They think this stuff is cool. And they get hooked on that jolt of energy they get during a raid.”"

"Narcotics investigators had made a controlled drug buy a few hours earlier and were laying plans to raid the suspect’s home. “The drug buy was in town, not at the home,” Taylor says. “But they’d always raid the house anyway. They could never just arrest the guy on the street. They always had to kick down doors.”"

"The thing is, when law enforcement officials face suspects who present a genuine threat to officer safety, they do tend to be more creative. When the FBI finally located Whitey Bulger in 2010 after searching for him for sixteen years, the reputed mobster was suspected in nearly twenty murders and was thought to be armed with a huge arsenal of weapons. Of all the people who might meet the criteria for arrest by a SWAT team, you’d think Bulger would top the list. He was also aging, in poor physical health, and looking at spending the rest of his life in prison. If ever there was a candidate to go out in a blaze of cop-killing glory, it was Whitey Bulger. And yet instead of sending a tactical team in to tear down Bulger’s door, the FBI did some investigating and learned that Bulger rented a public storage locker. They called him up, pretending to be from the company that owned the facility, and told Bulger someone might have broken into his locker. When he went to the facility to investigate, he was arrested without incident. Why can’t investigators handle common drug offenders the same way? A big reason is a lack of resources. If your department is serving several drug warrants a day, you just aren’t going to have the personnel to come up with that sort of plan for each one. A second reason is that drug offenders simply aren’t all that likely to shoot at cops, and it’s easier to use violent tactics against people who aren’t going to fire back. It’s by no means a universal rule, but often when police do face a genuinely violent suspect like an escaped fugitive with a violent history, a suspect in a series of violent crimes, or a barricade or hostage situation, they don’t immediately storm the place. They set up a perimeter or try to figure out other ways to make the arrest safely. This again isn’t possible with drug warrants—there are just too many of them. But because drug dealers aren’t all that dangerous, it works out to raid them instead."

(all from Radley Balko's "Rise of the Warrior Cop: The Militarization of America's Police Forces")