I think the OP is asking re: Kagi News rather than search. I would agree that I would value the ability to better “adjust” Kagi News results.
One option might be to remove eg RT as propaganda.
Another option might be to tune RT as a news source that doesn’t feed into the summary, but if it provides a significantly different angle in RT on a story maybe it is included in a card as “differing viewpoint” or something like this.
I understand that this might conflict with Kagi News being processed globally and not on a per-account basis. But I agree with OPs thoughts.