As an operator of several forums, I find the attitude of the owners closing the forum down because of people posting content they don't agree with, astonishing.

A forum is a sounding board for the opinions of everyone and heavy censorship is one certain way to kill any worthwhile debate, stone dead.

Every forum gets 'bucket mouth content' but this is dealt with by an efficient reporting strategy where either moderators quickly remove the offensive posts or posts are automatically hidden when a certain number of trusted members report a post. Anyone posting offensive content is quite rightly banned from the forum and such action will have the full support of the membership.
Posting comments which others disagree with usually results in a full and fruitful debate where everyone can add there bit and a consensus can be reached.

If there articles and comments which the forum organisers feel their organisation is shown in a bad light, it is up to them to defend their corner by correcting any inaccuracies but if the negative comments are legitimate, their time would be better spent addressing those problems and using the forum as a sounding board for ways to improve the situation, rather than throwing the toys out of the pram and pulling the plug.
There is a huge resource of knowledge and experience within the ranks of the motorcycle community and any organisers of associated events should be taking advantage of them rather than doing their best to alienate their target audience.