Josh Moon then playing "Fire" ("I am the God of hellfire and I bring you fire") is in extremely bad taste and outright vile. I can very well see this as gloating.
And yet, it does not prove kiwifarms direct involvement. It's a short extract from a stream he did. Playing devil's advocate for a second, it for example might very well have been a response to media at the time already claiming he/kiwifarms was to blame for the suicide and therefore a rather misguided attempt to poke fun at what he might have considered unfair reporting.
If the person burning the Rumsfeld photo contributed to his death then I might say they were gloating too.
I could easily find hundreds of such posts, but I don't want to waste my time if you wouldn't consider them.
Edit: to be clear, "allowing content" does not entail "endorsing content" per my original reply.
This might be well the case. I am not one of their users nor am I educated in this matter, so I'd like to know too. When somebody makes this claim, as has been made multiple times in the threads here, with demands to therefore remove kikifarms from the internet, I think it is reasonable to ask for at least some evidence of such a claim.