You can steal expertise from anyone in the world, do you do it and from who?

Here's the rules, anyone, anywhere in the world who has an expertise or is even good at something, or has some knowledge, you can take that expertise for yourself, but they do lose it in the process.

Nobody knows it was you but the person who you stole it from, they can no longer do tasks that that level, (e.g. an artist can no longer draw but you can)

Would you do it? Could you live with the guilt or would you pick some scumbag?

I think I would take Donald Trump's business experience, say what you want but the dude does have at least a moderate understanding of selling a product. I take that, make myself a decent living (I'm sure I can do it without conning anyone) and donate the rest, leaving him without the only skill that he really relies on. I would have to be careful though, cause if he has money, and knows who I am, he could probably hire a hitman, so I would have to steal his knowledge of his network as well