To put the hypocrisy into perspective, my Dad worked for IBM for years but advised my brother from working there.
Now, 15 years later, my sister is an intern there and will probably work there when she graduates.
I think that when you're IN an industry - any industry, you see the good AND the bad sides and therefore want to caution your children against the bad sides. I've heard many famous actors say they would do what they could to steer their children AWAY from acting.