  The phrase "most cruel and revolting crimes" has been used to describe some
poor historical treatment of vulnerable impaired persons by precisely those who
should have had the responsibility of protecting and helping them. We believe
we might be poised to see history repeat itself, as increasingly human-like
aware robots become capable of engaging in behavior which we would consider
immoral in a human--either unknowingly or deliberately. In the current paper we
focus in particular on exploring some potential dangers affecting persons with
dementia (PWD), which could arise from insufficient software or external
factors, and describe a proposed solution involving rich causal models and
accountability measures: Specifically, the Consequences of Needs-driven
Dementia-compromised Behaviour model (C-NDB) could be adapted to be used with
conversation topic detection, causal networks and multi-criteria decision
making, alongside reports, audits, and deterrents. Our aim is that the
considerations raised could help inform the design of care robots intended to
support well-being in PWD.
