Don't worry about my children - I have one in college and one about to start - both are perfectly capable of walking, talking and taking care of themselves.
I will add this to your comments about statistics: Your kids have a 100% greater chance of being abducted, harrassed or harmed walking to school than mine do. As I said before, I hope they never experience anything like that.
Umm... No.
I'm guessing you've never taken a statistics course.
Also, consider:
Some are abducted from their own homes. Do you allow your children to go outside?
Some are abducted at school, from the playground. Do you allow your children to play outside at school?
Some are abducted in stores, while their parents are shopping. Do you take your kids shopping?
Some are abducted from their own homes, in the middle of the night. Do you keep your kids in a barred and locked room?
Some bad things will happen. We CAN'T stop ALL of them. We CAN stifle and smother our kids' growth and experience in an attempt to do so.
I want my girls to have experience, be wise, and SEE the world with their own eyes.