Because of the culture of FP. FP inherited the legacy of Politics.Com (circa 2000-2005), which amazed me when I discovered it for how coarse the dialogue was and how offensive the trolls were. That all spilled over onto FP, and everything was great for that first year. Due to some problem children (Daesh and Dixie in particular), SR did a site shutdown around New Years (I still fondly remember the countdown, because a troll account mimicking the user name of ib1yysguy came on to announce he was gay). When we came back, SR had disabled BBcode (again, mostly thank you Daesh and Dixie), and he was implementing a plan to force everyone to re-register, upon which our IP's would be blocked from registering any additional accounts.
These two measures saw FP going into decline during the first half of the year already, and that's about when Damo began the creation of JPP. SR then made two spectacular blunders which killed FP for good. He trusted in us (LOL) enough to behave ourselves and be model board citizens, and unveiled his Full Politics Security Council, which would allow members to vote representatives onto a panel which was supposed to advise on matters of moderation. Specifically, it would be tasked with the power of officially declaring a poster to be a "troll." No one really bought that the four ideological categories for officers could be balanced-out, nor that the unanimous voting rule (candidates actually ran for positions promising to vote "no" on every vote) would be realistic. Plus, SR reserved the right to veto the FPSC. Everyone universally laughed at him on principle.
The other controversy remains a JPP legend, of course. Grind provided screen shots indicating that SR had the option to secretly read user's private messages (called U2Us on that site's set-up). SR lied, and denied that such a feature existed, when he could have just admitted that he had the option, but would never choose to utilize it. Chaos ensued, the guillotines began to fall, the pitchforks were raised, and FP was torn asunder. Not even an explosive round of Werewolf can compete with those amazing fireworks.