Can anyone provide any actual evidence that says this kind of thing makes children's lives worse? I was pretty uncensored as a kid and I'm honestly really grateful for it, i feel like it helped me adjust to the adult world well before my peers.
Honestly the things that got to me as a kid more than anything else was violence and the news. I recognized stuff like family guy to be fake and silly, but seeing and hearing about people getting killed or severely hurt in media and the news was sometimes traumatizing.
I take issue with how you're using "until they're able to" here. No age was mentioned, it really sounds like you're implying that they're not able to make decisions until they agree with yours.
Also not being vegan is not a decision that is going to harm them long-term. Seems like a perfectly reasonable choice to let them make at any point in their life.