Comments are third-class citizens on Skeptics Stack Exchange. This is a "question and answer site for scientific skepticism", not a "question and answer and comment site for scientific skepticism".
Comments are a necessary evil, to make the questions and answers better. They are
brutally casually deleted when they are not constructive at improving the question and brutally quickly deleted if they fail the 'be nice' test.
If we err in any direction, IMHO, we don't delete enough comments, but it is time-consuming to stay on top of them.
The deleted comment suggested the question was 'hopeless'. This is not constructive criticism, as it fails to show how to improve the question. (Just add more hope?) It is not factual, as this is just an opinion.
Tone is hard to convey in text, but at least three mods think its tone failed the 'Be Nice' test.
So, it was deleted.
If you have a way to fix the question, without fundamentally changing it, edit it. If you think the question cannot be saved, downvote, vote to close and/or post a nice comment with clear reasons.