Also, in a peer-to-peer protocol, things generally change fast. Nodes are offline all the time, it's hard to know who's a member. It’s all over the place. These PBFT algorithms don't really work that well in a peer-to-peer environment. One of the chief innovations of Nakomoto consensus/proof of work is that it doesn't require you to know who's a part of the network.
The reason you don’t see bad reviews is the alumni program, they invite you to meet your old classmates in “reunions” about once a year and they promise they’ll help you review your resume at anytime in the future should you decide to go back on the job hunt. But between us grads, we talk about how overpriced the program was. I even had an interview where the interviewer happened to be a hack reactor graduate, he was complaining about the latter.
Also, ISIS is the combination of all our mistakes. The failure of moderate Islam to embrace change, the unfair immigration laws of Europe that led to integration challenges, the failure of Arab and Islamic states to treat its people as equal citizens, and the West’s endorsement of many dictatorships and monarchies in the region.