Instead of a single source of censorship, against which the people can fight, there will be multiple sources of censorship, and fighting one won't solve the pro

Instead of a single source of censorship, against which the people can fight, there will be multiple sources of censorship, and fighting one won't solve the problem. And in your E911 example, there are already ways for this to be solved without requiring censorship or throttling of data on the public networks. You can already buy life-/safety-critical bandwidth that is "off-Internet bands", if you need it - the point is, this isn't lumped with the 'general public Internet'.