One of my biggest issues with RDR2 Dutch is he does not at all act or feel like someone living in 1899. His views on Natives, blacks, gender all are anachronistic. The man was born in 1855 and has similar views to a liberal from the 2000s. I get it, it's a video game not everything has to be super historically accurate but so much detail is put into making things look like they are from that time but then you just have this guy who feels totally out of place.
My view of Dutch has always been that he really doesn't genuinely give a shit about much of anyone, all he really cares about when it comes to other people is what they can do for him or how he can manipulate them into doing something beneficial to him. He maintains a thin veneer of civility and politeness for a while but when his back is against the wall, he doesn't care who he needs to go through to get out, even if they're friendly to him or dedicated to him. A big part of the game is Arthur realizing that despite all of Dutch's superficial "noble savage" bullshit and Robin Hoodesque sermonizing and his grand plans, he's nothing more than a common thug, he just happens to be smarter than most of his contemporaries and can spin a good yarn. The one thing Dutch does in the entirety of RDR2 that might indicate he cares about anyone genuinely is when he
offs Micah on the mountain but he doesn't stay that way for long, considering by the time he's next seen in RDR1 he's killing civilians for the hell of it and running around with a band of Indians who's bitterness over losing their land he exploits for his own gain. He actually exploits the natives that he supposedly "cares for" and "commiserates with their plight" in both games he appears in, that's something I'd forgotten about. In general in the start of the game he probably does genuinely care about the people in the gang but only so much as their success is also his success, but as things get more and more dire it becomes clear how selfish he is.
Anyway I don't particularly see a lot of earmarks of modern leftoid stuff in RDR2 personally. A few remarks or lines of dialogue maybe, but overall, the gang is supposed to be a bunch of outcasts and it makes sense that there would be at least one native dude, one black guy and a Mexican dude in the gang. Since they're already outcasts they're likely to commiserate with the other characters who've been outcast for whatever reason, like Javier who got run out of Mexico before he fell in with them. That's not to say that parts of the game aren't colored a bit by the makers' own personal beliefs, that's pretty much unavoidable, but overall I played through the entire game and never once felt like I was being beaten over the head with The Message

, the few outright political things [like the KKK burning crosses or the LeMoyne Raiders bitching about niggers or the Indians complaining about stolen land or the eugenics guy] make sense given the time period.
That's just me though, if people found the political messaging in the game odious, I'm not gonna tell them to like it anyway but personally I didn't find anything too irritating in it. I liked that basically none of the characters were totally one dimensional. My complaints about the game are mostly regarding gameplay issues and also the Guarma chapter is kind of a slog.