Wyrm is correct. Toxic magicians and Dissonant Otaku were the ones responsible for Crash 2.0. Of course, both were doing things for their own reasons, and both were convinced that they were just using the other, and would dispose of their 'partner' when the job was done, but yes.
Toxics are dangerous not because they are overwhelmingly powerful, but because they are zealots, willing to do anything for the cause. The cause will vary from toxic to toxic, but the combination of magic, and the fact that they are all fragging psychopaths means that they don't have the restraint that most magic-users may have. The ends justify the means. You are with us or you are against us. Think of all the damage your normal eco-terrorist or religious extremist can do, and now add in magic. That is why toxics are dangerous.
Likewise, Dissonant technomancers are basically like toxics of the Matrix. Like toxic magicians, they have their own motivations, but their goals are no less extreme, whatever they are, and they are utterly committed.
But individually, in terms of raw power, a Toxic magician or a Dissonant Technomancer is no more powerful than a regular magician or technomancer of their initiate/submersion grade. What makes them frightening is their madness and conviction.
