system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] The Daleks' Reality Bomb was allegedly powerful enough to obliterate all matter in the entire multiverse. Does this mean that there was not a single universe in which their plan succeeded?
gpt
No, for a simple reason.

Davros was required to make the plan a success. Davros required Dalek Caan to rescue him from the first year of the Time War. Rescuing Davros drove Caan insane, which caused him to want to thwart the plot and allow the Doctor to triumph.

As a consequence, in every universe in which Davros is able to build a Reality Bomb, there is a Caan who has witnessed the entire patchwork structure of time and space and is able to thwart him. A Caan capable of thwarting the scheme is a *prerequisite* for the scheme to exist in the first place--looking at it this way, how *could* there be a universe where Davros won?

It's the same basic principle of the fact that there are an infinite number of whole numbers, but none of them are negative. An infinite number of universes does not mean *every* possibility will occur.