It's funny because it's true. It depicts exactly what would happen if Greens weren't just imbecilic mindless morons and instead took pride in being the murderous petty tyrants they actually are. You know, if "don't assume Evil where it can be explained by insane stupidity" weren't so true. Except for all that part where 'Evil == insane stupidity' but I digress.
Oh and Gaia's a fucking traitorous cunt, that part's true as well.