Not explaining is a bad idea, since it means that people who disagree have no chance to be convinced or even understand the motives if not convinced, so they are much less likely to effectively cooperate with the new course.
Instead, explain at length and let people discuss, but at some point explain that the decision is final unless some major new elements come up.
People who disagree are not going to be convinced by corporate comms. It’s not going to happen. It’s a bigger distraction than what you’d otherwise get.
The idea is not to release "corporate comms", but in full transparency, honesty and with complete willingness to be proven wrong release all the data (email messages, meeting transcripts, web sources, documents, spreadsheets, simulations, etc.) the decision was based on and your thought process.
Instead, explain at length and let people discuss, but at some point explain that the decision is final unless some major new elements come up.