I question the ability of someone to make assumptions without knowing more details.  As the father of the child mentioned, I am upset that you should decide to reduce what was a truly beautiful, heartfelt and effective approach to something merely "well-intentioned."  I also encourage you to read more closely next time.  My wife and I did indeed tell our son immediately that there were trains in heaven.   

And I also want you to know that for both sides of my sister-in-law's family this is the worst death they have ever experienced.  This includes those in the family who are older.  So to say that much worse deaths are yet to come is uninformed.

And finally, age does not always imply wisdom.  My young sister-in-law who passed away was one of the wisest people I've ever known.  She was wise in the ways of the world yet humble in her dealings with it, something from which I hope we all can learn.