That's not what jumping the shark means. You think they are simultaneously being genuine about wanting to reduce school shootings but at the same time claim they are standing on their classmates graves and deserve to be mocked?
If it is their conviction that guns are a major factor in school shootings, doesn't it logically follow that if you refuse to pass gun legislations (often because you take bribes from the NRA) you are partially responsible for future school shootings? From their point of view, that is absolutely the truth.
I still don't see why they deserve to be mocked by "adults", especially wife beating trashbags like D'souza.