We have to speculate about it, but it is a reckless maneuver that has led to the nee, rapid losses on the main front. I would expect that it is reckless ideologues trying to push it.

Ukraine has seen some high-profile resignations just before and during this, so it is possible that the early resignations was people opposed to invading a sliver of Kursk and the later ones might be people that wanted to invade.

But this is just guessing.