Turtlepower is correct here. Unfortunately, deleting a topic means deleting all the posts in that topic and if we allow members to delete their own posts and topics this gives the topic poster the power to remove a topic, there isn't really any way of getting around that.
Thankfully, this isn't something that comes up to often, I'm just sorry that it has done so.
I suspect Bladestorm himself did not want to delete anyone's posts but his own, but did feel a violent desire to distance himself from gaming for reasons of his religious conviction, eg, perhaps he felt that having posts by him around and topics about subjects that he participated in was some form of "temptation" for him.
I can't say whether that desire is good or bad or not, indeed I do recall Bladestorm himself was quite clear that he did not think games in general! were evil or sinful, only that for him! games and a devotion to christianity were not compatible.
This isn't an attempt to justify what he did, just to point out that under the principles this forum is run on, he was unfortunately free to do so.
Is it a right royal pain in the kneck? of course it is! as Adel said, having a centralized discussion topic on a given subject is a very useful thing indeed and having that suddenly removed is going to be a pain for all concerned as well as for new players of the game.
However, all we can do is try to pick up the pieces. Bladestorm has made his choice and it's one we just need to live with.
I therefore suggest people who are concerned set about writing up the appropriate information about Bokerano Daibuken, (as I believe has already started), perhaps with some retrievals from google cash, (though not of Bladestorm's own personal posts), and the guides could be reposted in the articles room.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)