Most giant robot anime, and most anime in general, seem to be anti-war or anti-violence (barring the relentlessly capitalist shows like Mazinger-Z and Voltron which say nothing beyond “explosions are cool” and “buy our toys”). The shows that luxuriate in violence, like Black Lagoon, make clear that the characters are psychologically damaged in some way. The shounen fight series are either about making friends (like One Piece), are comedic (like Ranma 1/2), or have a stick up their ass and continually remind the viewer that the hero is only fighting reluctantly (like Bleach). I suppose the atomic bombings and the enforced postwar pacifism are ever present in the Japanese consciousness.
Though two series that glory in war and violence are the right wing wankathons Total Eclipse and High School of the Dead. One of the characters from the latter show even remarks, as he’s using a baseball bat to bust open a cash register, “You know, this is pretty awesome”. And he’s right, it would be goddamn sweet to be running wild in a zombie apocalypse with a Humvee full of guns and big-tittied girls in high school uniforms. Or being encased in a mechanical womb and using swords, cannons, and other phallic objects to unleash death and figurative semen on hordes of invading aliens.
Of course, there’s no such thing as zombies or alien invaders, which is to say that there are no faceless Others one can morally slaughter; thus, in anime, the depiction of violence simultaneously demands an apology for its use. But it seems that it takes a right-wing dickwad to not give a shit about such distinctions.