Odd that a dentist would have surveillance cameras and no alarms on his windows that would have called as soon as the window opened or broke.
Any names published? I'm smelling drug deal all over the place.
Many security systems can be programmed to sound a local alarm when the residents are home and awake; the remote alarm is triggered only when the system is completely armed. The system would usually be completely armed only when the residents are gone or have retired for the night.
Many people don't arm the alarm system until they're ready to go to bed; this guy probably hadn't done so yet. And if I lived there (I know this area, it's waaay the hell out on the fringe of suburbia next to a marshy wildlife refuge), I'd have surveillance cameras *and* several outdoor motion sensors.
This is a modest '90s neighborhood, but a number of the houses there have iron fences right up to the sidewalk with rolling driveway gates. Prior to Katrina, it was a rough area due to the usual New Orleans blight, plus the added attraction of Vietnamese gang activity. Don't know what it has become since then.