There has been one successful slave revolt in recorded history and it wasn’t in Sparta. Legislators can be selected any way that leads to state survival in the end. Estate taxes have bugger all to do with austerity.
The Spartans aren’t pawns in our current political drama. They existed for themselves not for us. A great deal in how they lived was odious but they were no more fascist than they were Christian.
I don't really like your "one successful slave revolt" statement, because it depends on the meaning of "successful" and "slave", so it seems interesting at first, but it is not really possible to think or argue about it without restating it in a clarified form first (even though there is some truth in the statement). I suppose you were thinking about the Haitian Revolution?
[0] https://acoup.blog/2019/08/16/collections-this-isnt-sparta-p...
Mostly, though, fascism is ineffective.