Creating a decentralized forum is not so tough
If you think it's easy, then a generous donation from theymos is waiting for you:I would love nothing more than to be able to shut down bitcointalk.org due to some decentralized solution making it obsolete. Find me a 501(c)(3) nonprofit working on this, and I'll donate to it.
all we need to do is make it like democracy
You're kidding, right? Democracy is centralized. As democracy we can choose a members from active local boards
Who's "we"? 
Only one member is allowed and the local board members will vote for their leader.
What prevents someone from creating alt accounts and voting for themselves? Will you impose KYC to prevent that? If so, then what will prevent buying and selling KYC votes from the Internet? (The answer to the last one is obviously "nothing"). And even if you have a solution to both, whom will be trusted with the KYC data? We obviously can't publish all that data, because then there would be no privacy, which is the devastating for democracy. Forum software there are plenty of minds who can make this forum hard for the government to disrupt us.
Our best course for censorship-resistant communication is Tor, but that wouldn't be a decentralized forum. It'd just be more difficult to shut down. If the forum was created for Bitcoin then why not use the network to run the software?
I don't think people think twice before parroting this. Explain me your thought on this. Step by step, how would it work? I want you to realize yourself how dumb idea this is.