A curious person might notice some coincidence here and there but a person tuned into synchronicity can perceive a larger picture of reality. Although several people through the years have wanted to be or have been set up to be a copycat of something, sometimes there is a larger pattern that's just under the surface. This pattern can unfold over decades or even centuries...
http://copycateffect.blogspot.com/2018/02/SyncsParkland.html
How could the perpetrator smuggle a big gun into the HS in the first place? Isn't there suppose to be some security people stationed at all the HS doors? Can deranged people just walk in with a baseball bat or a machete as well?
https://en.wikipedia.org/wiki/Stoneman_Douglas_High_School_shooting
Janet & Stewart Swerdlow's observations on the Florida HS shooting & some other things
https://www.youtube.com/watch?v=QIjvB3z1ryg
https://mvextra.blogspot.ca/search?q=Stoneman+Douglas+High+School
