Four cops dead and four wounded

Charlotte NC - Four cops have been killed and four wounded in what preliminary reports are of an attempt to serve a warrant for felon in possession of a firearm.  The reports so far seem to be that the warrant was of the no knock variety.  Why do they need at least eight cops to serve a warrant?  Now you will know what lies ahead for gun owners.         



If a person is too dangerous to be trusted with a firearm how come they are not in prison or a nut ward?