There's a common theme to a lot of Tom's posts. As his theories get disproven and his evidence debunked, he always retreats behind the semantics of whose job it is to prove/disprove whatever is in question. This is basically the "You can't fire me, I quit" tactic of arguing, and it frustrates people because it's an entirely separate and irrelevant issue. The point of debate is to examine facts and opinions on both sides, and weigh them against each other - NOT for one side to simply present evidence to the other for approval.
In a nutshell, Tom, You are not the Keeper of the Truth - The world isn't flat by default until such time as you choose to declare it spherical. We are not here to dethrone you, and likewise, you cannot remain King by simply refusing to participate. You can argue the burden of proof all you like, but neither you nor I nor anyone on this site is the Grand High Terrestrial Geometry Master. This is not a court. There is no judge or jury. You cannot win or lose to anyone but yourself, so if you're afraid of coming out and arguing for something, rather than against the opposite, maybe you need to think less about what you believe and think more about why.