Your grasp of decentralization seems very loose. Hive is not an attempt to impose authority. Rather the goal of Hive is to enable sovereignty. These principles are opposed.
You may be more comfortable on a centralized platform given your desire to conform users to authority.
There is no need to inform to authorities if we are responsible for what we do as individuals, there is no right to threat other people. And is a crime not only legally but moraly as well.
Of what sovereignty are you talking about if we as community allow this kind of behaviours? and do nothing about it, is that a political concept of freedom or what?.
And don't need a centralized platform, in fact I don't use facebook, twitter nor other social media but this. Can you afirm the same?, I don't want a centralized platform but a responsible one.
What sovereignty do you have if you are only allowed it? You do not grasp that your freedom to do and say what you want isn't the only sovereignty there is.
If you oppose @heimindanger's actions, you are free to flag him. That retains your and his sovereignty. If you call for banning, or imposition of other institutional mechanisms, you oppose his sovereignty, and prove yours does not exist. Your call for institutional action is a call for actual power to effect your desires, and only issues as a result of your lack of it.