Because an NPC will inevitably be made to say something racist which will be screenshot and posted on Twitter.

I believe no company in the world would want to put out a game where an NPC could be coaxed into presenting a sexy story featuring an infant Adolph Hitler and Jesus Christ.

It's just a headache that I wouldn't want, I guess.

Or maybe we just need to evolve and realize that people are going to use tools for what they want them to be used for, not what we want them to be used for.

People have apparently already found workarounds for Midjourney's nudity filter.

StabilityAI was smart enough to realize people will get around that, and allowed the objectionable content filter to be removed via commenting out a few lines of code.

It's our sensibilities that need to change, not our tools.

There are filters on the most common LLMs so you could obviously tune outputs to be within some range of possible outcomes.