Thanks to George W. Bush, the idea that a politician could change their mind based on new information got popularized as being a “flip flopper”, and discourse was shut off thanks to the juvenile repetition of the term, along with “stay the course” and “you wouldn’t change horses mid-stream” phrases that W was noted for.
So changing your mind as a politician is always a difficult thing because opponents will attack you for it, and of course it’s bad in the US thanks to the grade-school level of discourse in congress choosing things like “flip flopper”, “snowflake”, or claiming earthquakes and floods are punishment from god.