You put all those as if they were hard rules, but you could probably make games where you include these. It would just be stupid because you would severely constrain your audience and normally people want as much audience as possible.
There is also not a single group of "we". There are some examples of such groups:
- Of those playing games I think the majority wants fun and finds being forced to watch or even do such things not fun even though they know its not real.
- Some other people playing games similarly would know its not real and thats why they use them to try out things they would never want to do in real.
- Of people not playing games I guess the silent majority is just not interested in them and doesnt speak out.
- But sure there are some vocal people wanting to protect children(or even all people) from having to see disgusting things and thats why movies, games get labeled with an appropriate age and people producing them surely try to not loose customers by including inappropriate stuff and then being restricted to selling to a smaller group or getting bad press.