If you or Rolf did try to stop me from pressing that no-AI button then you would just be obstacles that needed to be eliminated, even if your motives are pure. My life and all that I hold dear is at stake!

I understand that you don't want to die or lose the future, and I understand the ingrained thought that UFAI = total loss, but please try to look past that, consider that you may be wrong, see that being willing to 'eliminate' your allies over factual disagreements loses, and cooperate in the iterated epistemic prisoner's dilemma with your epistemic peers. You seem to be pretty obviously coming at this question from a highly emotional position, and should try to deal with that before arguing the object level.

What we can do without an FAI is by far superior to any scraps we can expect smiley-face maximiser to contribute due to exchanges.

That it's far superior is not obvious, both because it's not obvious how well we could reasonably expect to do without FAI (How likely would we be to successfully construct a singleton locking in our values? How efficiently could we use resources? Would the anti-AI interfere with human intelligence enhancement or uploading, either of which seems like it would destroy huge amounts of value?), and because our notional utility function might see steeply diminishing marginal returns to resources before using the entire future light cone (see this discussion).