A couple of dangerous fires were purposefully set in East Greenwich Tuesday. Fortunately, it was just part of a demonstration. Firefighters were comparing the damage done by fire in homes with smoke detectors versus homes with sprinkler systems. The Rhode Island Fire Sprinkler Coalition demonstrated what they described as the “simple technology” that can save lives. The two model homes set up side-by-side: the first one, only with a smoke detector; the second one, with a smoke detector and a fire sprinkler. The one with only a smoke detector becomes engulfed in flames once ignited with a waste bin fire. It takes minutes for firefighters to arrive.