I think there are multiple possibilities to the reason why the chat would be disabled:
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It has to be disabled for law enforcement to do a complete sweep of all conversations to scan for any possible leads.
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It is to prevent access to possible prying eyes because of the event. Thus hindering uncovering interesting conversations.
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To prevent gamers from coming to the board saying they all experienced the same thing. The same thing that someone actually acted upon [FF].
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Reconcile. To prevent an avenue from all coming up with a cover. To make one account consistent with all others.
Order of likelihood.
4.1.3.2