I'm not sure how Knight Terrors ended, but Waller's plan here is specifically saving the day (from a problem she created) so she can make herself look better.
So its not just making the public further distrust heroes, but to also gain their adoration and trust by pulling a Syndrome and falsifying an act of heroism.
Which if this ends with her accomplishing her goal then thats going to suck because Waller has become such an annoying Villain Sue, pretty much bullying and getting away with everything she does. There has to be some pushback or failure to this characters machinations, not even Darkseid is this successful.