@rrolo1
I get your point but the thing is, the gay clause does not undermine the premise. This is just a fact. Why? Simple: The premise is that the kids were enrolled in the Government Notice System without their consent, it was imposed on them by their parents, and onto those same parents, by who? Society at large, which believes that Not Being part of the Majority = Failure/Problem that must be removed. This is the premise, the fact that they were imposed a system that they did not agree to, but are being forced to agree to because society deems it "good". It is a commentary on current social customs in Japan, as well as its birthrate problems.
The whole series has been a way to attack said premise with the Love (or "Love") aspect being the focus, but there are other focuses, such as (Which hasn't been touched yet) people that are OUTSIDE the notice program, they exist, it has been stated that this is the case, they are just a minority, there's also the Gay problem, what do they do with Gay people? Being addressed in this chapters.
The thing with this arc is, Gay people would throw a wrench in the index of "Happy people brought together by the notice" the government is pushing in order to have good public opinion and "Force, but not really" people into entering the system, because its "The Right thing to do". They are manipulative, they hide shit, they use underhanded tricks sometimes even threatening people to push their propaganda: "The Notice is a purely Good and benign program. There is NOTHING wrong with it. Its ALL Pluses, and no Minuses."
The Gay clause its a super messed up way of doing said manipulation, because they are helping Gay couples do their own thing without actively destroying their chances at normal love relationships because, again, they want to look towards the public as "100% successful". And you know what's the worst part? They are doing it in a way that you can't just call them "Evil" straight away, because, even if their methods are shady and kind of messed up in some instances, people are coming out of it happy and agreeing with said methods. It's pretty good psychological manipulation right there, on a Society level too, which is messed up.
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This whole show rides on this conflict of "What society deems Correct, Acceptable, and Normal" versus "What the characters feel is correct, acceptable and normal" is just that the focus is love relationships, that's it, really.