if a society is constructed in such a way that some folks are being left out, that society is broken, not the people it decided to neglect

Reality itself is broken by your definition and facilitates the existence of fascism and similar things far more readily than it facilitates a situation which can work for everyone. In fact, it doesn't facilitate the latter at all in almost any context. Reality will smash your limbs with a hammer and laugh when you call it the one who is broken as will society.

Your reaction to this debate (which is a troll debate btw) is very emotional, you are disgusted with the cruelty and unfairness the universe will keep indifferently manifesting long after you're gone. Making society fair is a less realistic goal than killing off the entire human race.

The greatest evil doesn't come from letting evil exist, it comes from trying to eradicate it. It comes from plastering ideals over a messy reality and trying to force it into unnatural shapes. Honestly the less you can manage to give a fuck about anything that doesn't have to affect you the more you win as long as you don't take that to mean "ignore potential risks and opportunities that have to do with politics and economics etc". If you want to make life more fair, look for opportunities to do so but be aware of the severe limitations and the fact that you are acting on an opportunity and not an ideology about how nature shouldn't be the way it is.