Actually, a lot of thermal imaging is very poor for specific target identification. You see heat, but not detail. A person's head may appear as all light (or dark depending on how the display is set) and be in specific contrast with a clothed body, but you may not be able to identify the person as being a particular individual or may not even as a either friend or foe. You know exactly where the person is, but detail is missing.
Low light scopes can provide a lot of that missing detail and you can see things like facial features, uniform construction, etc.
There was an episode on one of the shows like "Wildest Police Chases" where a night chase is being followed by a helicopter using an IR (FLIR) system. At one point, the spotter lost track of the suspect and police who were on foot and passing into a parking garage. One person emerged from the side and the spotter reported the position of the suspect exiting the building as being on the X (north, south, east, west) side. The spotter was correct in that the susupect did exit that side, but the person he saw was a trailing officer. Realizing the suspect was going for an exit on that side of the building, the officer hopped out over a wall in hopes of taking a shortcut. The suspect came out about 50 yards away, followed by another officer who was in close pursuit. The spotter misidentified the low detail glowing FLIR object as the suspect, but in reality, it was the officer. On emergence of the suspect, the appropriate correction was made and no harm done, but it sort of illustrated some of the problems of IR imaging.
Currently in the works (as of a few years ago) is a melding of technologies between IR, low light, and video enhancement to provide color detailed night vision. Either it is still too bulky or problematic as it hasn't seemed to have made it to the market yet.