Share 'How much should I teach my children about veganism?'

I have two boys, 7 & 9 years-old, and I want them to understand my choices, To what degree do I expose them to the issue of animal rights? Is it too extreme to show them Meet your Meat or Earthlings? I wish someone had been in my life when I was a child that would have helped me understand. Am I forcing my values on them? All this is more complicated because my ex-wife is an omnivore.