Exploit him for financial gain?
My dad was very similar to the person described. Smart as all get out, just never presented with the right opportunities, and ended up working an assembly line for his entire working life.
The difference between a factory job and a more professional field like software is that in a professional field, your employers benefit from you growing. It is worthwhile for them to invest in you because it makes business sense.
In a factory, you're a cog in a machine. Often the management goes out of their way to ensure you know your place. A lifetime of being put down like that leaves scars that are hard to get past.
"What you know is right" means working to get past that baggage and the other baggage in his life, because the person has the potential to be more than he currently is but has been conditioned their whole life not to see it.
You can sit back and give someone time to improve and mentor them but what if during that time you find out they’re pregnant. Now you can’t fire them without going through an entire process.
Now I’m not saying this is a legitimate fear, but I’m sure at least some people believe this to be one. For my sake, I wish I were able to waive many of the protections employee rights give me so I can guarantee interactions desirable to me.