The same way people still fly the Confederate flags even though it no longer has meaning.
Like many answers about this topic, people fly that flag because they have not escape their past. The still look at the past like it’s their most glorious and happy moment. They fought for that regime , believed in that regime and their friends died for it.
Now, if you ask me i will say that it is a dangerous thing to do. Being too attached to the past is the same as being too attached to your ex. What’s done is done, there will always be something out there that’s better.