I appreciate what you're proposing here, but I feel this would make the problem worse, not better.

First, the existing text *does* cover this:

> Questions that are not a good fit for this site may be voted closed by experienced community members. Closed questions cannot be answered, but are eligible for improvement (and eventual re-opening) through editing, voting, and commenting.

What you wrote isn't bad, but it has two problems.

1. It is a "wall o' text". If the user can't read and comprehend the above simple sentence, the odds of them reading and comprehending 3+ paragraphs more, is slim to none.

2. It enables whining. Because it starts with "my question is valid" and goes on to say "your question *might* have been unfairly closed! here's how you can complain about it to anyone who will listen!" it will cause no end of friction. The reality is that **most questions are closed because they were NOT, in fact, valid**. So getting users into this "I done been wronged!" mindset is a very bad idea.

I am open to some refinement of the text that is there, but

1. No walls of text. 

2. No whining or enabling whining.