If you run this URL against Norton SafeWeb, it gets a GOOD Rating. I Copied and Pasted the Following Results...
Norton Safe Web has analyzed gundata.org for safety and security problems.
Summary: Norton Safe Web found no issues with this site.
Computer Threats: 0
Identity Threats: 0
Annoyance factors: 0
Total threats on this site: 0
I thing most people are just trying to slam a gun related website.