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I’m just imagining that sudden switch, like, everyone in the League has taken a call from Amity Park at some point. They’ve had daily calls for years now, there’s no way that they haven’t. So there’s this collective realization of every single league member, at the same exact nanosecond, realizing all of a sudden, that: “why were we ignoring those distress calls?! They called so many times!” And they all panic, because clearly something was going on here. Someone had to’ve cursed the town. There’s no other explanation for it. Why else would they have all had this realization at the same time? Why are we realizing this now? Is Amity Park ok? Did the town get destroyed, thereby lifting the curse?
I saw the idea that Wes Weston, everyone's favorite fan character, has the curse of Cassandra and no one will believe any of his "visions." Since I have been on a DCxDP AU kick lately, I feel the desire to combine this.
So, the reason the justice league never came to answer any of amity park's distress calls? It is because Wes made a call for help at the very beginning, before he even knew about his curse. The curse took hold and every message after that one was dismissed as a joke by the league.
It is only when something or someone breaks the curse that the league collectively realize they have been ignoring thousands of aid requests for years.