Before marking this as a duplicate of this related question, take into account that my question is about the reason why this happens, not the cause of it, which is what the answer to that question addresses, not explaining why this mechanism is in place.
The Help Center page on reputation doesn't even mention it.
Editing a question takes time and effort (relatively) which is rewarded with points. Very understandable.
But when your edited question is removed, you lose those points. Why? The removing of the question is something out of the control of the editor.
It seems to me that the message is "Don't put effort into editing questions that could be removed". But that's just a gamble.
Two point are not that much, nothing to cry about, and I won't. After all it's a "sum 0" situation. But I think this is a valid question.