I'm not sure what this has to do with it, as people who commit real-world serious violence for frivolous purposes are not regarded as valiant heroes, even in war.

And yet it's fun to watch people who commit fictional serious violence for frivolous purposes. So what's fun to watch isn't a terribly reliable way of telling what's considered good.

Are the entrails leading me astray?

I'll try to reword my post to avoid those connotations. Anyway, “right-wing/theist/low-Openness/nationalist” was supposed to imply "not the whole of humanity, and therefore I wouldn't assume Bundle_Gerbe is from that cluster without any evidence other that they are human", and by “‘side’” I meant something roughly like "each of the two regions of ideologyspace you get when you split it by the sign of the first principal component".

How big is this "plenty"?

I don't have statistics, but probably around 50% of my high-school classmates. (More recent social circles of mine aren't unbiased samples.)

America still has a huge military

Never been to the US and don't know much about it, so I won't say anything except... doesn't it still have (say) 95-year-long copyright too?

and I haven't heard of any mainstream agitation

Are you treating non-mainstream groups the way you accused me of treating right-wing/theist/low-Openness/nationalist groups?

for shutting it down as a gang of murderers and slaves, which would be the consequence of actually believing that. In fact, I rather doubt that any country anywhere, ever, has had any substantial movement for disbanding its military on these grounds.

As for the “slaves” part, well, conscription was recently abolished in my country (two years before I was supposed to be drafted, lucky me!). And whereas there aren't that many people who propose to disband the military altogether (which is a much stronger position than not thinking soldiers are heroes), pacifism doesn't seem exceedingly rare to me.