Even by the DUP's standards, Mrs Robinson's politics comprise an unpleasant concoction of bigotries, seasoned with a predictable dash of ethno-religious fanaticism.
This unpalatable dish is served up with a sizeable side-dollop of spite, epitomised by Iris's triumphant nine-finger salute which taunted Tory MPs after DUP votes had secured a Government victory on 42-day detention, or by her serial "unparliamentary" harassment of the Health Minister, Ulster Unionist Michael McGimpsey, for which she attracted official censure.
It is possible, of course, to elicit human sympathy for Robinson in light of the mental illness which has forced her to step back from her duties. Perhaps the condition might even permit a kinder interpretation of the extremity of some of her outbursts.
But the sum total of hatred and intolerance encompassed by Northern Ireland's politics will be diminished by Iris Robinson's retirement and that is not a result to lament.
Iris Robinson deserves support as she attempts to recover from a debilitating condition. Most people in Northern Ireland will be all too aware of the damage which depression, and other mental illnesses, can inflict upon friends and family.
We can, however, extend the Strangford MP sympathy and good wishes without applauding an erratic and unconstructive political career, occasionally characterised by a vicious and vindictive use of language