... Umm.
Same reason as why if you want to rob your own country you become a politician?
No, you wont be using your "insider" position to wheelbarrow out the loot, as suggested earlier, no, the money quietly disappears into a Caribbean or swiss bank account, and all trails are erased.
The entire premise of our modern western civilisation is to rob one another. The plumber overcharges for shoddy work, the lawyer creates convolutions and entanglements to draw out the case, the politician opens locked doors for developers, tendered services, or erosion of protective laws, etc. The children's toys are loaded with lead to make them feel more substantial, forget that they poison our children. Everyone is rorting the "system", and everyone in the "system" is being rorted. We convert a paradise to a cesspool, with man made oasis for the elite to travel between, their feet never touch the contaminated ground WE tread.
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Well lets see, you have the keys, know the combination to the vault and the security codes for the alarm system comes to mind first.
Ever hear the old saying that "the biggest crooks wear business suits"?