If the developers chose to remove it, that's not a big deal. If they just decided "Eh, this is a fictional world in the future, there'll be different symbols. It's too on-the-nose to have the exact flag", good for them. No big deal.

Nobody is upset about it being removed from a player's perspective.

The issue that people have is the developers are being censored. And specifically, what's being censored is something that represents a group of people are actively being attacked and erased in parts of the world.

I hope that this explanation helps you see the situation differently. There's nobody who's upset because "I wanted to see the flag". It's bigger than that.