The Endless are AI's. They are not "clearly sentient people." They are AI's programmed to act like the people they are based on, but as we see in the case of Sphene, even that programming can be "tweaked" to emphasize or de-emphasize things about them. They are the equivalent of ChatGPT's given bodies. EW was about valuing beings that were actually real, living creatures. DT is about letting go and moving forward with our lives.

Also, don't forget that Alexandria itself effectively invaded and conquered part of Tural. It exists on the Source, in Tural, and is part of Tuliyollal's empire (including the Turali people it took away from their own lives by isolating them inside the dome). In the end, Alexandria invaded Tural, fought a war against Tuliyollal and lost, and is now part of Tuliyollal's empire as a result.

It may be time to step away for a bit. When someone reaches the point of shouting about "unforgivable" things in a video game and declaring the writers incompetent because one personally doesn't like the story they wrote, that sounds like a good sign it's a healthy move to detach oneself.