I hate to break it to you, but “killing people and taking their stuff” hasn’t been what D&D is about for years.
I hate to break it to you, but it is certainly a large part of what D&D is about. I had a 25 year gaming gap. There are some major changes in how the game is played these days compared to the 80s, but mostly this has to do with cleaner mechanics, more modern sensibilities on sex and increasingly on race, and much stronger emphasis on story.
But every D&D game I've played in, whether at conventions, Adventurer's League, or private games have involved significant amounts of combat. And even with how AL rules control and abstract wealth and treasure, I don't recall any party going to turn in the shinnies to the local authority's lost-property office. Nor do I recall parties just leaving treasure where it lie. Maybe a McGuffin or two where the hook of the adventure was to recover something for some one, but those recovery operations tended to involve some baddies getting killed and non-McGuffin loot being taken.
The only D&D games I can think of that didn't involve some killing and looting were those I've run. But even in my home games, these tend to be mini campaigns or single-session affairs, because that's just not the kind of game most players expect and come to play. And I find this across races, sexes, and age groups.
I don't think it is just an observation colored by my cohort bubble. I see the same thing playing Roll20 games overseas where I'm the only American in the group. And, hell, look at the rules. There are a heck of a lot of rules for adjudicating killing. Look at the official (and most third-party adventures) adventures. Seems like you are expected, if not encourages, and certainly given ample opportunity to kill and loot.
Any impartial observer, even if they have never played D&D in their life, even if they have had no exposure to TTRPGs, can spend a few minutes browsing the core books or an adventure and see that it is a game that involves killing or looting.
We can debate whether that is good or bad. Whether the game should be fundamentally changed to discourage this play-style. But to say that the game hasn't been about this for a long time is a bit silly.