There's nothing special about our industry, crazy people are everywhere.
It's a simple numbers game, become popular enough and your popularity will cover some number of mentally unstable individuals.
Actresses, singers and presidents have all been shot for no other reason then they were famous.
Public criticism or lack of coverage probably makes things worse for Arrington, but I'm guessing not by much. Crazy people by definition do not behave rationally.
I'm not sure there is a solution to that beyond, make sure you keep as much of your life as you can secret.
The name of the young actress who was killed by her stalker some years ago escapes me, but I think he was able to get her address form the DMV.
Arrington can either quit, or keep paying for security, or find a way to keep his office and his home secret.