Threads all get deleted for a reason.
Threads get deleted when they are discriminating, hateful, or useless. Albeit, there are many threads that fall under such categories that have yet to be deleted (if ever), but if somebody starts using the forum section of the site to hate against one particular person, or discriminate (against a race, religion, etc), it is not appropriate for that thread to remain on the site.
These forums are intended for discussion of various topics, related to skiing or not, but not to be used to spread propaganda, or put down other people for any reason whatsoever.
That is why threads get deleted.
And yes ^ it is also true that this is not a democracy. If, for some reason whatsoever, one of the admins deems it necessary to delete a thread, they have the power to do so - even if they delete said thread because they don't like the letter 'X' being used more than 20 times in a single post (on the basis that it was used 21+ times).
They're in the position of power, and they can use it if they want to. Get over it.