So that means you don't believe the analogies you offer, or haven't (yet) noticed the contradictions in your head.
People aren't lacking in logic to suggest the AOO fork shouldn't exist. Here is a comment I posted to my blog by Mike Conlon, who has written papers about forks in software: http://keithcu.com/wordpress/?p=2962. We disagree, not because we lack logic, but because you lack knowledge.
Furthermore, AOO and LO have different implementations of the ODF standard. LibreOffice is constantly improving their ODF support. Every time they do this, it creates a new incompatibility. ODF is also not static and simple like the zip format which is easy to have multiple implementations of. Furthermore, what about incompatibilities in sharing macros, incompatibilities for people writing documentation, incompatibilities for companies trying to support both products?
I know there are a few people who contribute to both, but you'll find they are confused or have contradictions in their head, like you.
Don't feel bad for some of us hijacking the comments. Feel bad because you are wasting money, wasting the time of volunteers, creating confusion, hurting free software, helping Microsoft, an ineffective steward of the OpenOffice brand, too stubborn to listen to the people who complained about your plan 2 years ago, etc.