Okay, so we're conflating Gandhi and Thoreau and The Dude a bit here, but the idea is generally there. Thoreau's work on Civil Disobedience actually mentions the Mexican War directly, somehow leaving out his own terrible role in the subjugation of Mexico. Denial is a powerful thing:

"That government governs best which governs not at all', and when are prepared for it, that will be the kind of government which they will have.... The objections which have been brought against a standing army... may also at last be brought against a standing government... Witness the present Mexican War, the work of comparatively a few individuals using the standing government as their tool."

- Count Dolby von Luckner

I like how Frederick et al are only in this episode for one panel, and that they don't even do that much in their panel.

Also, this here is a different historical comic about Thoreau and his views on the US Government and war.

--Geoff