Indoor vs Outdoor cat - Why are there more "house" cats now?

I read a bizarre news story about a man who got angry at his cat. I don't know what motivated the police to stop him and look through his car trunk, but they found his cat alive and marinating in peppers, oil and spices. He said he was going to punish the cat for being mean to him, by cooking it for dinner.

As I mentioned in my previous post, it is a sick, sad world and I don't want any crazy people or drug users doing weird stuff to my cat, so I feel safer keeping her indoors. I live in a city apartment and some teenagers were shot 7 blocks from where I live, so both my kid and the cat stay indoors where it's comparatively safe.