Why is the CQRS repository publishing events, not the event store?

Question

According to http://cre8ivethought.com/blog/2009/11/12/cqrs--la-greg-young the component responsible for publishing events using an event publisher is the repository.

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Answer 1

Storing and publishing the event must an atomic instruction because if one of both actions fails, the listeners of this event will be out of sync with the producer of the event.

There is a another (more expensive) solution, compared to publishing the event from the event store, which is to use 2pc transactions (two-phases commit).

you can find some more intereting information here: https://cqrs.wordpress.com/documents/building-event-storage/