Let me chuckle on it a bit. (By "it", I mean the person's ridiculousness, not your sentiments.)
If they think that sons and daughters of murderers and rapists turn out to be even worse murderers and rapists, then it's likely that the world would be filled with nothing but murderers and rapists. And since neither we nor the anonymous friend of ours is a murderer or rapist, then it only means that the anonymous friend probably thinks that "murderers and rapists" can be classified under a breed called "tooth fairy" or "Gremlin".
If that's so, then the reason this anonymous friend is sending out hurtful messages anonymously is because even their parents are those anonymous-hurtful-message-senders, which means that even their grandparents would be anonymous-hurtful-message-senders (probably sending hurtful messages via a letter but actually dropping it in the house, knocking their doors, and running off like those bell-ringing brats who annoy the grandpa screaming, "Get off my lawn!"), until we realize that their whole family has been sending insensitive messages for generations now, and this could probably link to a whole conspiracy of hurtful-message-sending, that must have resulted in.... oh, I'm too afraid to even think it!
They probably hold torches and go around chanting, "Let there be hate! But wait a second... didn't we hate the ones who let there be hate? But if we hate to hate, then why do WE hate? Oshit, we hate ourselves..."
And there you go! They feel bad about all this already!
Beyond that point, I do think that children are magnificent beings -- they hold no truth yet, but they hold no evil either, and the things they are capable of doing no adult could even comprehend. I just wish your child had the opportunity to live longer; I'd have liked to see the miracles he / she could perform.
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