If your ethics are such that you believe the state should be able to view data on someone in order to help prosecution of a crime then you could support the retention of data on all users in order to avoid deletions made to hide criminal activity.
Such an ethic creates a moral reasoning to not comply with an individual's wishes in the immediate deletion of data.
(FWIW I'm not defending this position nor suggesting it's the case here, just you said there's no moral reason that can support it, which seems wrong; different ethical systems can provide different reasoned moral outcomes.)
Such an ethic creates a moral reasoning to not comply with an individual's wishes in the immediate deletion of data.
(FWIW I'm not defending this position nor suggesting it's the case here, just you said there's no moral reason that can support it, which seems wrong; different ethical systems can provide different reasoned moral outcomes.)