In this YouTube, around time 2:32, Harry Potter and friends come across some locked chests on their train ride to Hogwarts. Never mind who they belong to -- Let's loot it!
In most RPGs, you typically have to be a thief or rogue, or explicitly take some kind of lockpicking skill -- thereby making a conscious decision to learn and/or invest in thievery. But with magic, you can loot things just because you have the power. Might makes right?