If you drill it into your kids from an early age you can mould them to become whatever you want. If you bring them up to believe they want to enter politics and become president and you support them through it then THAT is what they'll want to become and be happy about it.
You might aswell lead your kids into a good job and good career rather than just leave them to it and let them choose themselves later in life. Otherwise they'll get to the age of 18 and just choose any old shit career.
Hey, Watson...the 1920's called, they want their theories back.