The GOP purged Liz Cheney because she voted to impeach Trump after he incited a mob that attacked the Capitol on January 6th, tried to overturn an election he lost, and then pushed the fake electors scheme in multiple states. When she wouldn't get in line with that - when she actually testified about it to the 1/6 Committee - they removed her. So yes, they purged their soul. Or more accurately, they showed they never had one. Any party that chooses loyalty to a single man over fidelity to the Constitution has crossed a line that doesn't come back. This isn't normal politics. Cheney will be remembered as a hero. Trump will be remembered as what he is - and most of the GOP will be remembered as complicit.
People say this is just party discipline, but that's nonsense. Party discipline doesn't require you to pretend an election was stolen or that January 6th wasn't an attempted coup. It doesn't require you to defend someone convicted of 34 felonies. There's a difference between loyalty and cult behavior, and the GOP chose the latter. History will judge them harshly for it, as they should be.