Even a generally rational person may write an irrational article once in a time. (I am speaking generally here; I haven't read the specific article yet.) To create a list containing only rational articles, someone would have to check each one of them individually, and vote.

Adding such functionality to LW software would be too much work. But maybe it could be done indirectly. We could do the voting on some other website (for example Reddit), and import only the positively-voted links to LW. But this would need a group of people to add new articles, read them, and vote.

That's a stupid argument.

There are multiple valid criticism of the way things are labeled but if you want to make that criticism it would be worthwhile to think a bit deeper about the structures and why they are arranged the way they are.