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This is how NPD currently works, submit an enhancement request around what you would like to see NPD to around deletion ability and your specific business requirements. NPD is meant to be collaborative and generally trusting of the participants.
However, there are some validation events you can leverage in NPD that may help if you find your implementations have a lot of incidents of malicious behavior and users behaving badly. For example, you can tie a validation event on the activity delete action that doesn't allow any user to delete unless they are in a specific group. See the Extensibility Pack for more details around the events available in NPD and general reference implementations.