Please refer to my post again.
I wasn't referring to a solid green light. I was referring, like the passage you bolded, under 2 to the green arrow. There is a big difference between the two.
Here is what I was referring to.
"(2) Vehicular traffic facing a green arrow signal, shown alone or in combination with another indication, may enter the intersection cautiously only to make the movement indicated by such arrow, or such other movement as is permitted by other indications shown at the same time. Such vehicular traffic shall yield the right-of-way to pedestrians lawfully within an adjacent crosswalk and to other traffic lawfully using the intersection. (3) Unless otherwise directed by a pedestrian-control signal, as provided in K.S.A. 8-1509, and amendments thereto, pedestrians facing any green signal, except when the sole green signal is a turn arrow, may proceed across the roadway within any marked or unmarked crosswalk."
The bolded (your bolding) refers to those that entered legally and are still there.
The op also referred to a green arrow, not a green light maybe by mistake.
"I have to cross a 9 lane road each morning and afternoon going to and from work. I always wait for the walk signal and remain in the cross walk while crossing. Today I had someone sit and blow their horn at me because they were making a left, the arrow turns green at the same time the cross walk turns green, and they were miffed I was blocking their way."
MillauFrau's post you quoted was also referring to a green arrow.
Nobody disputes that a solid green light for left turners can be active at the same time as a walk signal for the crosswalk they have to cross. That is what we here call a chicken left, ie, you can turn left unless you're chicken of oncoming traffic or pedestrians or in more standard terms, yield to oncoming traffic and pedestrians. But again what I referred to and what the conversation was about was a green arrow, not a solid green light. The walk sign in the crosswalk that the left turners have to cross will not be active at the same time as a green arrow any more than a green light would be active for oncoming traffic the same time as a green arrow for the left turner. That is how stoplights work in the U.S. That is what Millaufr posted and quoted. And as for malfunctioning, there are systems to prevent it. It is not impossible but highly improbable. Once fire ants got into a cabinet, jammed the relays and multiple directions turned green. But another failsafe has since been added.