Why does the right wing hate the Parkland shooting survivors?
Because they survived.
Kurt Vonnegut wrote, in “Slaughterhouse-5”:
“...there is nothing intelligent to say about a massacre. Everybody is supposed to be dead, to never say anything or want anything ever again. Everything is supposed to be very quiet after a massacre...”
So for there to be survivors is not according to plan. If witnesses testify, then the massacre failed. The right wing, taking the side of massacre, blames David Hogg and Emma Gonzales for disturbing the peace of the grave.