When you're still too young to shave, optimism is a perfectly legitimate response to failure.
Putting a halt to this was a legitimate response to keep lawns beautiful for all our residents.
In some cases the behaviour may be a legitimate response to strong competition.
However, I cannot say that nonviolence is the only legitimate response to systemic violence.
My own culture has no word for suicide; it is an irrational act and, as such, cannot be considered a legitimate response to our situation.
Was remaining in Germany and protesting from inside the system a legitimate moral response to Hitler?
I think it was quite a legitimate response, actually.
But resistance is a legitimate response of the occupied against the occupiers.
They are justified under international law as a legitimate response to prevent a grave humanitarian crisis.
The Cercas report offers a legitimate response to this objective.