He wanted to do it because he likes mindless action and because he had the elf actors on hand and wanted to give them more screen time.

I don't ever remember be so exhilarated by an action sequence. And I really, really doubt that that was the reason. I really, really, really, really doubt it. Not saying that I agree with the change. I just don't think that was why.

Concepts that didn’t even exist in the slightest way until Jackson stuck them in. I can’t forgive that.

Like?

Criticizing a film adaptation because it's different from the book is senseless.

True, but it is difficult to find that middle ground.

Jackson has a simple mind

Umm, I don't think that that is entirely true.