i use to wonder how neighbors didn't hear or see anything when we have cases on here. However, two things happened in my life that changed that viewpoint. We were living in the city, beside a gas station. One morning the police knocked on my door to asked if I saw or heard anything during the night. I had not. My bedroom was the closest to the store. During the night, someone had broken into the store, and knocked the huge window completely out. The window facing my house!! The second incident, we had moved to the country. The house behind us was sold. There was a small field between our house and that neighbor. We usually heard their parties, cutting wood, etc. Well, one day that house was gone! I never heard or saw anything! The whole house had been moved and had to go beside mine to get it moved, yet, I didn't hear the large equipment used to move it, or see the house being removed!! Still don't know how it happened, as it had to be daylight to move a house! But, I didn't even know until I went outside and it was gone. Baffling, but I don't wonder about neighbors seeing or hearing anything anymore!!!
Now for a perp, that's a huge risk to take. Assuming no one will see or hear anything. They won't know whether they'll be seen or heard! Not a gamble I would want to take. Then again, I have no plans to kill anyone either! That's a bigger gamble!