It doesn’t have to bother you personally to be unfair. I don’t pay this amount of money on their games and consoles to be bombarded by ads. It’s not a “big” problem, but it is a problem. Some people don’t want to see so many ads, to be tempted to buy stuff all the time or have a bloated home screen.
Just because you don’t mind doesn’t mean everyone has to do so as well.
There are ways to get it without destroying the machine. If it’s an electromagnet it will cost you several thousand dollars because there is cooling helium inside you have to remove, but you can stop it. Even if it’s a permanent magnet there are techniques to remove metal objects. Incidents with metal objects in these rooms happen all the time in hospitals.
I don’t get why you would defend this stupid cop, especially by making stuff up. A medical device like an MRI scanner is infinitely more important than a gun, for god’s sake. Even if we assume they cost the same, what deserves to be saved is the medical device.