> What exactly are the current ones doing that makes them generate 'black Vikings'?
There is presumably a system prompt or similar that mandates diverse representation and is included even when inappropriate to the context.
> How would you change it so that it doesn't do that but will also generate things that aren't only representative of the statistical majority results of large amount of training data it used?
Allow the user to put it into the prompt as appropriate.
> Would you be happy if every model output just represented 'the majority opinion' it has gained from its training data?
There is no "majority opinion" without context. The context is the prompt. Have you tried using these things? You can give it two prompts where the words are nominally synonyms for each other and the results will be very different, because those words are more often present in different contexts. If you want a particular context, you use the words that create that context, and the image reflects the difference.
> How would your method be different from how it is currently done except for your reflecting your own biases instead of those you don't like?
It's chosen by the user based on the context instead of the corporation as an imposed universal constant.