Agreed. Even some of the latest IR missiles (AIM-9X I believe) also include a visual seeking component to compliment the IR seeker, and try to identify aircraft types based on their outlines (presumably for orienting the missile for maximum damage).

You just can't make that distinction with people, especially not if just using IR or the likes. The guy with a rifle slung over his shoulder just happens to look like the guy with carrying a rake. Hand gun in hand happens to look the same as a power drill. Someone wearing a beanie looks suspiciously like a soldier with a helmet.

This all feels like a really bad idea.

There are limitations to the technology, but in right scenarios it is perfect.

One should not use it on attack, when people need to distinguish between a soldier and a civilian.

But on a defence, when you need to keep a certain area empty from enemies (and there is nobody else but enemies incoming), then it resembles the usage of mines, only better (both in terms of efficiency and safety/callback/disarm).

Another scenario or cutting the logistics. If you know that a road is only used by military, then letting the automatic drones watch and engage is a great idea.