More recent examples to hand

Althouse notes philospher/law prof (shudder) Brian Leiter's philosophical take on the Wisconsin mess:

Meanwhile, the Republican criminals in Wisconsin forced through their attack on workers' rights, leading to an uproar in Madison. . . . At some point these acts of brazen viciousness are going to lead to a renewed philosophical interest in the question of when acts of political violence are morally justified, an issue that has, oddly, not been widely addressed in political philosophy since Locke. (Ted Honderich's somewhat controversial work on Palestinian terrorism is a recent exception.)

Since Locke, eh?