Josh Moon (founder) gloating on stream about getting Chloe Segal to kill herself after KF harassed her for 5 years
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.