And if you admit that Lelouch could probably find ways to get around any security measures on Earth today, I suggest you read the Lensman novels by E.E. Smith. The second-stage Lensmen and their main enemies had mental powers that put all geass users to shame. Any of the major agents could singlehandedly overthrow any government on Earth today from the other side of the planet -- or exterminate the human race.
And why do you say there is no point in pointing out less violent and destructive ways of achieving Lelouch's goals, because Lelouch does not care about that? The entire point of many of my posts is is to pint out the difference between what a good person would do and what Lelouch does.