Sending in SWAT was specious at best, as the "evidence" was not particularly compelling. I get they were searching for a number of violent carjackers, but (as we see): The carjackers were not there, and more importantly, they were at least smart enough to know that when they saw AirPods, they should ditch them.
The qualified immunity angle is simple: Qualified immunity means there's vanishingly small chance of legal recourse for the people whose property has been damaged and lives have been turned upside down because any of a number of dumbassses in the chain of errors couldn't imagine somebody born in the last two decades would know to ditch a homing beacon.
The only reason Chauvin is in prison is because is simple: massive amounts of public unrest. It's easy for some outlets to dismiss unrest in some areas - for example, conservative outlets like to dismiss unrest in more liberal cities like Portland, for example. That leads to the problem you can't ignore: when you've got a riot in deeply conservative, police-supporting, sleepy, and almost entirely white Salt Lake City over a cop killing a black man over a thousand miles away -- that's a different matter entirely.
In nearly every case nationwide, the police can destroy your property and literally end your life with near impunity due to qualified immunity, as long as they have "probable cause." In this case, the "probable cause" was a set of AirPods (wisely?) dumped out the window by the carjackers.