Something similar happened in the UK, as the major parties moved towards a consensus as they both went after critical centrist voters (because the left and right voters were not going anywhere else - at the time anyway).
Trump is a cause of destruction. He is literally making those decisions. He is to blame. Trump and project 2025 are what republicans and conservatives were trying to achieve for years and years. Again, it hapened intentionally.
But noooooo, must blame Obama. Anyone except directly responsable organizations and people.
They are not some kind of insane people outside of politics and government. They are literally the republican party.
Even if every single Republican got voted out, the rot is still there, just wearing the other hat.