I don't live in the US, so I am maybe missing something but, if the police wants to arrest someone, wouldn't be easier to wait until this person leaves the house, grab him on the street and tell him: "Hi mate, we are the police and now you are under arrest". I don't see the need of assaulting a home.
Depending on where you live, that's exactly what happens. In Kentucky, they'll send (usually) 3 state troopers, and knock on your door. If the person that they want isn't at home, they'll take your word for it, and let you be on your way. In Ohio, it's usually six or more officers with guns drawn. They'll try to open the doors of the house to gain entry without knocking or announcing their presence. When the person t…
I've known SWAT officers and non-violent drug dealers who were both fundamentally decent people.
The problem can often be traced back to how police departments make up budget gaps. A large chunk of a department's budget comes from federal funding. The more drug related arrests, the more "war on drugs" money a department gets. This inadvertently enters a slippery slope where militarization on both sides is incentivized.
If local communities actually covered the full budget of a police department, the system would probably tend towards a more just and appropriate level of force.