In a fullblown dictatorship, Problem-Reaction-Solution is strictly unnecessary. The government just muscles the people and does what it wants. Communist Russia & Nazi Germany are two good examples from opposite political poles....where each merges into its opposite on the circular political spectrum.

But for Western democracies, because they have overcome the darker forms of tyranny in the past, and where Freedom is ingrained among the people as a Birthright, brute force is not a sufficient means for unscrupulous government actors to impose their will, at least not until or unless the power residing in the people is dramatically reduced.

Thus, we have Problem-Reaction-Solution as an effective tool of manipulation.