Because they have identifiable owners who might wish to travel to Europe and not risk someone deciding to make an example of them.
I would be more worried about being struck by a meteorite than such a thing
Again, I agree it is very, very unlikely. But it’s possible, and in an age of mass outrage it isn’t incomprehensible that some activist, somewhere, might latch onto something they don’t like and just doggedly pursue someone. It does happen.