This isn't about Trump; if it was, Cheney would have been out shortly out after being one of only ten Republicans to vote in support of his second impeachment. The issue with Cheney is that she has nicer things to say about Biden and the Democrats than she does her own party. You can believe her criticisms are valid, but the GOP cannot deliver a unified opposition message as long as Cheney is throwing bombs from the inside. Forcing her out is the only logical conclusion to what she has brought upon herself.
They're cancelling her because of her conservative beliefs.
This, but unironically. Cheney is much more conservative than Stefanik according to the Heritage Foundation rankings, for example. It's mind-curdling to watch partisan Democrats come to the defense of Cheney in this instance.
You have to be deliberately misleading to try and frame this as “defending Cheney”.