Can Someone Please Answer This?

I haven't been paying attention to this Casey Anthony trial until...well, today (I tweeted a joke right after the verdict was read, 45 minutes later the head writer of Letterman tweeted almost the exact same joke. He got retweeted 200 times, I got retweeted once. Thanks, assholes!), but I am very confused by this case.

So here's my main question, and if anyone knows the answer, I want to hear it.

Okay, let's say I have a kid. I'm a single dad with a 3 year old. His names is Irwin Jr. One night, I tuck little Irwin into bed and say good night.

The next morning I wake up and he's gone. Just missing. So what do I do? Well, I enjoy my breakfast and the peace and quiet, that's what I do! That little bastard never stopped yapping, good riddance. Plus, I start planning for the local booty shaking contest because this ass gets cash.

I go to work, and go about my day like nothing happened. I'm sure Jr. is fine, 3 year olds need their personal space, after all.

And this goes on, and I never see if he's all right or call the police or do anything. 6 months later, they find Jr. dead. It turns out he big wheeled down to the red light district, did some meth, fucked a whore, caught an extremely fast moving strain of AIDS, and died.

Here's the question: didn't I commit a crime of some kind? Sure, I didn't give him AIDS. But he's a 3 year old! Don't I have some responsibility to take care of this kid, no matter how much he loves AIDS infested whores?

It just feels like this lady, regardless of what actually killed her daughter, at the very least did something very wrong by not calling the cops when the kid went missing.

Right?