“Were my protests against the downfall of our country wrong, because you might think they showed ingratitude?”

Philippica II, Sections 5 & 6, as translated by Michael Grant, in Cicero : Selected Works (1960), Part One: Against Tyranny; Ch. 3: Attack on an Enemy of Freedom: The Second Philippic against Antony, p. 104
Variant translation:
What kind of favour is it to abstain from doing evil?
Philippicae – Philippics (44 BC)
Context: Nevertheless, let us imagine that you could have killed me. That, Senators, is what a favour from gangsters amounts to. They refrain from murdering someone; then they boast that they have spared him! If that is a true favour, then those who killed Caesar, after he had spared them, would never have been regarded as so glorious — and they are men whom you yourself habitually describe as noble. But the mere abstention from a dreadful crime is surely no sort of favour. In the situation in which this "favour" placed me, my dominant feelings ought not to have been pleasure because you did not kill me, but sorrow because you could have done so with impunity.
However, let us even assume that it was a favour; at any rate the best favour that a gangster could confer. Still, in what respect can you call me ungrateful? Were my protests against the downfall of our country wrong, because you might think they showed ingratitude?