At a certain point you feel it or you don't. You can believe other people when they say they feel that way, or not. Up to you.
Imo, "the vast majority of the audience already agrees" reflects an attitude that can come across poorly...even if the audience agrees. It's the sense of certitude more than the claim itself.
LOL I'm certain because I'm extremely familiar with polling on attitudes to arms-dealing/trading!
The vast majority of the public in virtually every Western country, even the US, very sharply disapproves of
selling weapons to basically any external country/empire/etc. Like, countries making weapons for themselves? People in the country doing it usually think that's absolutely fine. Cooperating on defence? People start to get a bit more uncertain, but it's kind of okay. But
selling (rather than giving) weapons to countries/people which couldn't otherwise access them,
for a profit? The vast, overwhelming majority of people, cutting across any supposed political divides, disapproves very thoroughly!
I don't think it's much difference from disapproving of slavery or child labour or the like. It certainly polls quite similarly.
And the SW movies absolutely expect us to see those things as bad (and quite a lot of other things, too!).
Do these points need to be made to Star Wars fans, in particular?
???
I mean, no, and they're not being made to "SW fans in particular". Thinking that they are seems to be seeking offense, to me. The idea that Rian Johnson think people viewing SW movies are uniquely sexist or pro-arms-dealing seems obviously laughable to me. Like Lucas basically quoting Bush in RotS, Johnson is just putting stuff in that he cares about.
Thinking through the logic of the OT or PT makes it seem contradictory.
This remains illustrative of my point, and you did say "canon", which suggests more than logic being an issue (plus the movie attempted to frame it in a way that it wouldn't necessarily be generally applicable).
Honestly people being mad about this reminds me of people being mad about Darth Maul's double-bladed lightsaber, and other "lightsaber crimes" over the years, all of which people moved past in the end (just as they have with "The Holdo Manuever")
I'm not saying it doesn't raise points of discussion for nerds, but the idea that that's "antagonistic to fans" seems impossible to support.