You are comparing one thing (celebrities who sometimes get an occasional death threat) to another pretty different one (people who didn't choose to be celebrities who have every communication method to them and their family members flooded with threats every day, indefinitely) while ignoring the facts about both that are inconvenient to your argument (like the fact that celebrities generally take these things very seriously when there's even one of them.)
What Marilyn Manson does when one person calls in a threat to a concert venue is completely and entirely irrelevant to the discussion we're having here.
A celebrity is somebody who is known by the public. Anita was a celebrity before her kickstarter. She rised even higher now with the kickstarter. So she did choose to be a celebrity the same way Justin Bieber did.
Also, I do not say that celebrities do not care about death threats, and dont investigate them, but that they always had them. 50 years ago people still threatened to kill celebrities the same way people do now. And people still care the same way. So acting like it's a new phenomenon is not true. It's simply that the number of public figure sky rocketed with the fact that anybody, anywhere can now be a celebrity and so now more and more people are experiencing what celebrities always had. Stalking and death threats.
And from what I know, Anita did contact the cops, and they found no hard or even soft evidence that the threat was real or funded. Other youtubers have the same resource as she does or even less and get the same threats as she does, so I do not see why it's an issue that seem to be focused on her and some other people around her.
Again, Death threats sucks and should never be done by anybody. I certainly never do them. But being scared of moving around because of threats that were found to be false or non funded is non sense. If that was the case, everybody would hide in a house all the time and be too scared to leave because somebody, somewhere might kill them. The world is a scary place, it's not a reason to not live.
Dodger for example have a list of people she want banned from conventions she goes to because they are known stalkers who actually did stalking or made threats that were founded. And I totally respect that.
Hell, I would even say that I respect Anita. If she do not want to go, she do not have to go. But I wont defend her for not going and would call her gutless for not going. Does not mean I hate her in any way shape or form. I just find that a public speaker should be able to handle those things. When you speak about something, people might want to shut you up. That's life sadly.