Magneto's powers were a bit more refined than a mere magnet. He could control the metal much more exactly, allowing him to pull the microscopic pieces of iron out of the blood.
Not saying it would make sense in real life, but it works well enough for a movie.

"small fucking coffee ya twat" *lays down a 20*

I thought that sounded wrong, so I looked it up. Turns out, you're right. Chicago is number 10 in gun deaths. 247wallst (dot) com/special-report/2019/08/04/cities-with-the-most-gun-violence/

Obviously, you make a new one everytime you open one.

That was my thought. :D