This is a false equivalence. The Dixie Chicks correctly stood against the invasion of Iraq, during a time when Americans were insane and bloodthirsty. (Not that this has changed, but the wound was still fresh so to speak.)

The equivalent stance would be Taylor speaking out about Americas involvement in Gaza and the arming of Israel. By endorsing the Democratic nominee who by all accounts intends to continue letting Israel commit a genocide she is, in fact, doing the exact opposite of what you are suggesting.

The Dixie Chicks bucked the status quo, Taylor is endorsing it.