Might I suggest an impending crusade of sorts? I'm assuming that Paladins work in the same way that grimms or other supernatural hunters do. Perhaps they could attempt to wipe out supernaturals as a whole discreetly, however something goes wrong and the conflict ends up spilling out into the streets. Or maybe a group of radical supernaturals is going around actively trying to dispel disbelief so that they don't need to hide who they are to humans any more- something that would likely backfire due to humans being incapable of realizing they aren't 'top dog' when it comes to the pecking order.