The most disturbing and insidious sentiment of online mobs is claiming that the targets are "just being held accountable". Or that such people are just experiencing "consequences". I really can't express just how cold and bloodthirsty such statements seem to be. It's the perfect combination of justifying vicious behavior while also absolving themselves of responsibility.
To put it another way: If, in your opinion, twitter users are not subject to accountability based on the chaotic randomness of public opinion, then who are they being held accountable to? Who even determines what a "consequence" is in that scenario, or what the threshold for that bloodthirsty behavior is? Honest questions here, I really don't know what the solution is.