1) Reality TV cameras have no business going on a police raid, especially with children involved. This breeds a cowboy-like atmosphere and creates what my friend calls "Hollywood cops." It may have been the case that officers felt this was going to be an easy raid, and that the A&E film crew could get some good footage in the process. It is understandable that a city as economically challenged as Detroit might consider making some extra money by being on television, but this quest for a little extra cash may cost them big money in a civil lawsuit.
2) Proper police surveillance should have led the officers to know that a child was in the house. My friend, who is also an officer, described the intricate and substantial work police often go through in order to prepare for a raid. He said that they would sometimes spend days staking out the home of a suspect to ensure that they know who's inside the home, where the rooms are located and what might happen when they enter. It appears to be the case that the Detroit police didn't do their homework or perhaps didn't have the resources to pay for necessary surveillance.
3) The use of a flash-bang grenade appears to be uncalled for, especially with children present. One wonders if the use of the grenade was driven by a desire to impress the TV cameras. There are a multitude of ways to get a suspect out of a home, and a grenade is not the only method available for officers to use. The loud noise and spark from the grenade can burn innocent bystanders, and it angers me that this weapon was tossed anywhere near the place where a child was sleeping.