The tree felt abandoned? Did it suddenly turn into a 15 year old girl whose best friend has the same crush as her? King debunked the idea of the tree doing anything of the sort. To add to that, helbram's point was the
most extreme opposite of what you are suggesting. He was asking why the tree hasn't forsaken him. Helbram expected the tree to forsake king, which it never did.
As for the ban thing, I am not sure of what you are talking about. Fairies elsewhere? In the end there could be a billion billion fairies in a million worlds and none of them could make ban a fairy king in a context relevant to king' role. Its exclusively the sacred tree's prerogative.
I am not blaming the tree. I am merely saying that the idea of a red demon destroying THE sacred tree is ridiculous. The sacred tree which fairies use to fight is as a matter of fact immensely powerful. King himself fights by drawing power from it. He literally defeated helbram because he could draw more power than him from it. And not only it has an immense volume of power but it also has god knows how many abilities. Each chastiefol form corresponds to an ability or attribute the tree itself has, king makes that point every time he explains a chastiefol form. Helbram specifically used the roots of the tree to fight. So with that in mind, how could the tree, which is nothing short of a huge mass of power and abilities, be destroyed by the lowliest type of demons around?