How we cite our quotes:
The rarer action is
In virtue than in vengeance: they being penitent,
The sole drift of my purpose doth extend
Not a frown further. (5.1.2)
Prospero is honest here, as he forgives everyone that's wronged him as soon as they're in front of him. It is pretty clear, though, that neither Antonio nor Sebastian is penitent about their awful behavior. Does it make sense that Prospero entirely ignores this?