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You're taking a quite extreme example there to make your point. Obviously taking down systems that massively unfairly benefitted one group over another is disadvantageous to that group in power. The same argument for taking slaves away from slave owners. But the point is, affording the same rights to all women (AFAB or trans), does not mean taking rights away from AFAB women. Just in the way that making sure Black people aren't unfairly treated doesn't mean that white people need to start being unfairly treated.
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Sure it's an extreme eg. But if you give it some thought there will be plenty of other instances, big and small where the dominant culture is giving something up.
Overall having a fairer more equitable society is good from a moral pov, and hopefully gives the society the best shot at utilising all its resources.
Hang on a second. Admittedly I posted all those memes to move things along, but that bit makes no sense.
How can you have one group with enhanced rights and privilege, and then reduce or remove that privilege and enhanced rights without it being disadvantageous?
You can put forward a moral case for fairness, but there is self evidently a disadvantage.
What happened to all those 80s South African politicians? Apartheid ending didn't exactly do their careers any favours.