Why a thief? Bitcoin is a silly idea based on scarcity that doesn't exist.
If someone generated the right numbers by chance and had luck, I wouldn't say they'd be doing anything wrong getting whatever is there.
It's not the same as stealing data, and is not the same as hacking into a banking system. It's decentralized, and there isn't the concept of real scarcity. It's not even hacking.
https://henvic.dev/posts/bitcoin/