From a practical standpoint, there is a karma system on this site, it just is not implemented - every comment and post has upvotes. That those upvotes arent recorded on the user level is a choice.
It is always a balance of features. I dont necessarily agree with your framing, but even if I did, the community needs to ask itself if the goal is to be a tiny, uncompetitive alternative to reddit, or do we want to be relevant and deal with the consequences of more diverse participation? Incentives like the possibility of notoriety can motivate positive contributions as well. Some people want to be recognized for their meaningful contributions as much as people do not want to be downvoted for unhelpful contributions.
Thanks, that was a helpful reply. I am not exactly a tankie, but I am actively trying to avoid the more right wing pockets of the internet that are actively avoiding reddit. The venn diagram is small, I think.