Look, I'm gonna be blunt here: state legislatures are full of idiots. Just chock full of them. These are the places where the political careers of people who are too dumb, or crazy, or corrupt to win a seat in Congress top out. The talented politicians punch their tickets there and move up; the untalented ones stay there for decades. So it should not be surprising that state legislatures frequently produce awful ideas.
All that being said, though -- even by state legislature standards, this is a remarkably awful idea.
https://www.ktvb.com/article/news/local/capitol-watch/idaho-lawmakers-introduce-legislation-to-criminalize-those-who-administer-covid-vaccines-legislature/277-2436a514-e7da-4b31-9762-f9be10300075