Except in all the many, many countries where we get a bounce back and forth between centrism/right-wing and far right, which is far more common than the scenario you describe. I don’t understand how you can look at the US and Europe right now, for instance, and think that centrism never gets a look in and its jumping between communism and fascism all the time. And no, regular socialism is not far left. It isn’t just centre-this and then far-this, the middle ground exists in both wings, despite what centrists seem to think