Why are there gun free zones?

hy are there gun free zones but there's no other type of crime free zone signs? They seem to have a problem with rape at colleges - they couldn't post a no rape sign on the campus to let people know it's illegal? What about spraying R134a into the atmosphere? Most people don't know it's... show more hy are there gun free zones but there's no other type of crime free zone signs?

They seem to have a problem with rape at colleges - they couldn't post a no rape sign on the campus to let people know it's illegal?

What about spraying R134a into the atmosphere? Most people don't know it's illegal...it would help if there were signs that told people about it.
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