The whole premise of the game. Sure, it's dark and depressing, but the message of this game is simple: the reason humanity hasn't fallen to the countless horrors of the universe over the centuries, the reason ordinary people sleep soundly in their beds, the reason the protagonists of the other game lines (with a couple of exceptions, like Promethean and Geist) will NEVER win is because ordinary men and women step into the darkness and take up the Vigil. Many go insane. Most die. But for every candle that goes out, another ignites and the Vigil remains.
Such a combination of conflicting ideologies existed in a single cell — the famous (and possibly apocryphal) Greenwich Village Irregulars, who operated in New York City during the late 1970s. Though constantly pressured by their superiors in the organizations they served, these hunters refused to let their individual beliefs trump the friendship they had for one another. For many years, their activities were a symbol of unity for New York’s embattled hunter community, and survivors of that period credit the Irregulars with keeping the Vigil alive at a time when many were willing to surrender the city to the monsters.
So many Hunters appear to have gone from bad to worse on entering the hunting business. Then there's one of the Task Force: VALKYRIE agents:
You're a veteran of Special Forces. One time in Kabul, you saw things that they frankly hadn't trained you for. You dealt with it, though, and kept the details from your CO. But somehow TFV knew about it. You were back in the US within a week and working in the field in the mainland US in a black suit and tie. It's good to be home.
In an universe where Fantastic Racism and He Who Fights Monsters are disturbingly common, Spirit Slayers gives us an instance from Bronx in the 70s, where a small Union Cell known as the Ironmongers managed to find an agreement with the local werewolf pack in the face of gang violence, giving them no trouble as long as they would focus their hunts on muggers and drug dealers. Not only did they actually maintain this arrangement for almost five years, but it never was technically broken by any of the two sides- it just stopped because the Cell was disbanded after the death of two of their members in a completely unrelated event.
Despite being misguided like most of the Hunters, the Talbot Group has a surprisingly optimistic side to it compared to the other Compacts and Conspiracies. They approach werewolves as people who need help and medical attention rather than monsters who have to be put down. While they are incorrect on that point, this results in them having a surprisingly human treatment of them: the "wolf-children" they keep as patients are willing subjects who cooperate to the best of their abilities with them. And while they still have yet to figure out the true nature and purpose of werewolves, a specific group among them, the Counciliators, has started to put two and two together.
Mortal Remains actually has a surprisingly large number of stories showing hunters collaborating peacefully with supernaturals:
The Promethean section features a sweet story depicting the birth of a Promethean as seen by a member of the Long Night. After the corpse of a recently dead neighbour has been recently stolen, the hunter and his comrades start to investigate, only to find the lab in the aftermath of the Promethean's creation, with only traces of blood, pictures of the dead man and remains of a ritual. The next day, the hunter sees the missing dead man resurrected (actually the Promethean) about to leave the town... and, not sure of what has happened, decides to just let him go and waves him goodbye. Obviously delighted by such kindness, the Promethean smiles and waves back before departing.