Going from "unknown if alien civs with megastructures" to "proof of alien civs with megastructures" is new information that would change the trajectory of humanity.
What use to them is confirmation from an entity they don't even trust?
. Religious Cults. If you look at the religiously inspired insanity in US Laws and Politics recently, coupled with what's going on in, say, Afganistan, I'd say "check".
. Doomsday preppers. Check.
. All sorts of irrational behaviors. Well, if you include enabling destructive climate change in the face of overwhelming evidence, I'd say Check.
It's almost like we read all those stories and said "Hold my Beer".
Most people will say “meh” unless it affects their daily lives.
Tbh, churches funding an interstellar mission (to convert the heathens) would be a mostly good thing