Stopping behind the line at a red light

[deathtopumpkins]

With left turns like that car in your picture, there is always the possibility that he slowly pulled forward while waiting for a gap in traffic, and got stuck there when the light changed. That's happened to me before.
Though since there's no one behind him logically he should have just rolled back if this were the case.

Then he should have finished his maneuver instead of sitting in the intersection.  If he was waiting for a gap, he should have pulled further up in the intersection, not half-assed it by sitting way back there.

But he's not actually "in" the intersection, just in front of the stop line. The stop line is far back enough that he can be in front of it and not blocking any cross traffic. I know I would generally sit there and wait rather than just run the light, because it seems both less illegal and less dangerous to me.

Actually, according to the vast majority of cops and engineers you ask, he is in the intersection (even red light cameras are set up this way).  Anything beyond the stop line is in the intersection.

That's why I put "in" in quotation marks - because different people may have a different definition of what constitutes being "in" the intersection. I concur with NE2's quote from the Florida statutes though, defining an intersection as either the area formed by a quadrilateral whose points are the corners of the curbline, or the area in which cars would come in conflict with other movements.

[Alps]

Here in New Jersey, it is common to see at least two additional loops above the "STOP" line as well. This is true for both a left turn and thru lane. Although, in recent years, the state has converted many from loop detection to video detection. With video detection, you could easily adjust a zone digitally if necessary.

Not just common, state standard per the Design Manual - Roadway. People are very impatient in NJ, so you need to accommodate them all the way up to the curbline of the intersecting street.