I told him to
pound sand as suggested. It was really more a question regarding whether you ought to assay the ethics of everyone who wants to use your output. I've had a lot of requests from people who want to use my music and I tend to say okay to them all without necessarily reviewing what it is that they are doing with it.
I casually asked this guy what he was doing and he mentioned social activism which made me a tad nervous, so I did a bit of judicious Googling and found he was a registered sex offender who appeared to be in complete denial of his offences and who seemed to be advocating 'fair play for paedophiles' (I paraphrase) and maintained that being registered like this is completely unfair and unconstitutional, etc etc.
Aside from my reservations about all of this, those of you who know me better might also know that my 'real job' involves putting people just like this away in jail. A slight conflict of interests, you might say.
Mike