People into ham radio are very good in posting useless and/or nasty comments in forum discussions (examples ? Just look here to begin), so they will keep aggressive users busy with endless talks, leaving other people free to discuss what really matters.
1) Send email thanking for the report, and solicit them to visit a site for getting more info.
2) When they browse the site grab at once user's IP address.
3) Exploit the vulnerability they reported by hacking into their system.
4) Delete everything you can.