Again you make an assumption that people should automatically know about an MRI. I'm privileged enough to know because I love watching medical video essays and have the free time and access to do so. Not everyone has access to the same resources as you and I. Some people didn't have the opportunity to go to college. Some people had no easy access to the internet when growing up. Some people don't have time because they're working 3 jobs to survive.

I'm not going to insult someone because they don't know about x thing, because education is meant to be for helping others, not belittling anyone you meet just because you know more than them. Your first instinct shouldn't be to ridicule a deceased person for not knowing as much as you.

Put into example it's for a newfound medical examination that both you and I have no knowledge about. You trust the professional treating you that they know what they're doing. A clinic isn't going to assume you know every little detail about this. That's the job of the clinic and their technician.

You also conveniently ignore that the technician was with the said person when he entered the room, aka he trusted the technician that he wasn't doing something wrong. It's not a case of he's not allowed to be there and just so happened to trespass in with metal. He TRUSTED the professional here that he was allowed in and that there wouldn't be any issues. The technician failed by not making sure he didn't have anything metal. They should've thoroughly checked and even double checked before letting him in.