Because it draws more clicks to their site.

It’s not. No language in this article is written like it’s a huge revelation. It’s just reporting on a document recently made public.

Because gun manufacturers are evil, shitty companies that stoke the divisive gun debate in the US because it gives them free publicity. And because we want to believe that our entertainment products are made by companies that agree with us about that subject and will refuse to do business with gun companies.

Obviously this is a highly naïve worldview, but hopefully that explains why it is newsworthy.