Toxic community appeared for two reasons. Mainstream popularity(CoD, LoL, Dota etc) and/or false marketing/overhype a product. I believe this community wouldn't be this toxic if Bungie didn't oversell this game. Back in July 2014 after the Alpha(?), the forum were brimming with ideas and theories about destiny. It was truly a feedback forum. People talked about the Fallen and Hive, they talked about weapons and specifically Shingen C and people were writing fan fiction. Everyone was really looking forward to this game and get ready to soak into a new richly detailed fantasy world from the creators of Halo. All that dashed away after we killed some heart thing in the black garden and the speaker giving a really uninspired speech. Everything is a disjointed mess. The back of the box promised epic story and it was nowhere to be found, that's clearly false marketing.