For what it's worth and from knowing the chap pretty well,and having done so for a good number of years,
I personally would vouch not just for the validity of his character BUT also that he has personally helped many many folks out (often at his own expense and time) across the series world ...He would truly share anything he had to help someone out .
Having recently helped him move a great quantity of series spares from his EX-marital home and move counties,it's a great great shame that Jim has been suffering the vandalism he has been .Let alone losing his job as a result of it .
That said I can fully understand WHY folks would be reluctant to get involved with a **** daubing psychopathic arsonist on the loose ....
I think the thing Jim would appreciate MOST is a swift phone call to the authorities IF anyone spots anything relevant and maybe a nod and letting him know that folks have got his back and are looking out .