I’m afraid there’s not really much that can be done to simplify this down. It’s sort of just the way things are. It’s a bit like asking why two bodies with mass are attracted to each other. That’s just how gravity works.
You could think of it a bit like this: magnets produce magnetic fields. These fields then cause other magnets to want to move in particular directions. It’s like saying that gravity causes space to curve, and the curves cause mass to move.
I hope somebody can give a better explanation to this, but it’s a pretty fundamental question that you’re asking, and they tend to be harder to answer in physics.
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