I imagine that they couldn't be perfectly confident that they weren't just far enough away from the fixed point that their universe was the same as the one they observed.

A sort of a Roko's Basilisk, except with an omnipresent dread that they might be say, the 2nd or 3rd universe and the first just hadn't messed with them yet.

If they do anything that scares or abhors the people above, they could be turned off. Maybe they're not even sure if the people above them are waiting to see if they only benevolently observe the universe below them.