It is always sad to hear the death of a law enforcement officer....
The LEO goes out to keep the community safe in a variety of ways and does this for the people. He puts his life on the line to help make the quality of life better for the community. And for this he receives a small paycheck and is hated for doing his job.
The war on drugs will never be won but we must at least curb it as much as possible. The police do controlled buys and know where the drug houses are at. This is likely why they entered this guys house.
No knock and at night... why??!!
Drug dealers have guns so they can protect their cash and product. Other drug dealers will come and try to shut them down and take what they find.
If the police come during the day they can be shot walking up the the door and the evidence can easily be destroyed while keeping the police out. Catching the bay guy sleeping gives them time to get in and take the bad guy down without any shooting.
Unfortunately.. this does not always happen. Some people are there, waiting inside.... not for the police so much as the competition to pay them a visit. So asforced entry is made... they bag guy just starts shooting.
It should be noted that no knock warrants after hours are special and required a judges permission. This is used on really bad people and not the soccer mom for some petty crime.
But when your door is being kicked in, explosions are happening, and they are saying "Police Department!! Search Warrant!!" You might want to hold off on shooting or you will be tried for murder.