Which of course the major flaw of such a system is that the Alien overall will reduce society into a series of benefits and losses, with no real long term goals, and where the ultimate goal will be to take as few risks as possible.
In other words it creates an extremely short sighted system (afterall the alien only needs to live ONE generation. Why not structure the society for complete and utter ruination?).
At least if you put any thought into it.
It becomes harder in general to work with statements like "More people should include diversity" (as opposed to "all people should include diversity"), which is difficult to quantify in the first place.
The issue isn't so much in how true it is... but to what extent you are willing to go to ensure that... as well as what form it should take. "More people should include diversity" is pretty much a unarguable statement for the most part and if used as the basis for an argument should be rightfully met with "yeah, but so what?" It lacks any dimensions for discussion. Similar statements would be: Less people should be poor, More people should be healthy, Movies should be more intelligent.
One of the most complicated parts about diversity, for example, is how much to play up or down play stereotypes and roles.
The first response a lot of people make is that there should be no stereotypes, but then what happens is it created an unrealistically clean, banal, or unrealistic image of whatever it is, and often thus creating a counter-stereotype in the process.
Then there is the question on what are the stereotypes? What is really playing into them? how true are they? and how do you play into one without being offensive?
Thus you can have two entirely different groups both wanting diversity in media... But who have two entirely different ideas about what it is. You can have something that is considered incredibly discriminatory by one group, but considered almost a champion of diversity to another.
One good counterargument for the "If people were forced to include certain groups, they would likely be given offensive stereotypes" could be that medium awareness could increase the amount they are used correctly, for example.
Ethics really just boil down trying to marry morality with getting things done. Would a lawyer refusing to defend his client because discovered he was actually guilty be the moral thing to do? Arguably. Would it be the ethical thing to do? Well no because that just destroys the very foundation of how the system works.
I see proper ethics as a sort of long term morality sort of deal. What is better for everyone overall even if the moment to moment morality of the situation is compromised... but without ignoring the moral question. It is also "morality on mass" as well as "realistic morality".
It is why often making people include more diversity into videogames becomes a ethical question. Since it isn't about the moment to moment morality (though a case could be made), but rather the implications of forcing people to include state mandatory elements in their products. The reason why "Magical Capitalism" is often defended even to lunacy, is because the alternative is trusting the government to make these decisions for us.
There are other solutions mind you... you could
1) Commission diverse works
2) Create subsidies for diverse works that are given the A-OK by some sort of council
3) A Stamp that indicates that this videogame includes a diverse cast and that people should pay extra attention to it.
4) Create a stamp for games that don't have a diverse cast to say you should scorn it
5) Limit the ability for companies to advertise their non-diverse games
6) Limit where games that do not pass the diversity test can be sold or in what quantity
7) Tax non-diverse games. Thus making them more expensive.
8 ) Make it illegal to import non-diverse games
9) Have creators of non-diverse games have their picture taken and have their names and addresses put on the internet
note: Not all these solutions are... desirable... but here they are. Also here is a fun game: Guess which ones have actually been done in real life.