WTF? Why don't they just knock? Not to minmize the seriousness of the crime but it's not like they are raiding some gang bangers house. Too many Innocent people and even more family pets get killed in these dynamic entries for stupid crap.
Here's an idea. Watch the house and when the perv comes home during the afternoon or evening, arrest him at his door. You could probably take his keys and gain entry using the doorknob. Wrong house? No one gets shot, and the door is still attached at the hinges.
I guess they wouldn't get to have all that fun busting doors and threatening unarmed people with their rifles then.. Just sayin' !