the small minority of retards did the salute

The words "za dom spremni" are the salute, and everyone participated in that, Thompson initiated it.

There was little to no actual anti-communism at play at that point (although it was still relevant symbolically). Both sides were already capitalist. Yugoslavia had been on the path of liberalisation for quite a while before the breakup.

Btw, that excuse that Thompson and his fans regularly use is bullshit, the phrase was picked by Croatian extremists (especially the paramilitary HOS) in the 90s because it was used by ustašas (fascists) half a century earlier in the first place.

unless the ustashe independently invented it

They did, they weren't instructed by German nazis on what words to use. Not that it makes any difference, ustašas were just the local variant of fascists.

"some" = the one that's the basis of and technically closely tied to the one you're using right now