Parents in California, what goes through your minds with Sandra Cantu?

I am a mother of 2 small children, a 3y/o and a 2y/o in Tracy California where the girl was taken and killed. Although my children NEVER leave my site, or a family members site, I still get so afraid now. I feel so bad for the parents of Sandra, but also feel guilty that I can't help but be so relieved I still have my children to love, hold and watch grow. I know most parents, especially when their children are young, have those fears of what ifs and so forth, but now I get so afraid and worry what and how I'd feel if it ever happened to me. I know there are sick and evil people out there, I know that Sandra isn't the only child to lose their life so young, but I have never been this close to it. I mean, Tracy is a decent size place, but it isn't that big, and for it to happen in my own backyard. . .