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Look at the local rules in the first thread you have linked to. To single out everyone who has disagreed with you in the past and forbid them from posting in your thread, and then expect your thread to contain a meaningful dialogue or reach a relevant conclusion is a ridiculous premise. The whole point of a discussion is to hear opposing view points, and solutions will never be reached by living in an echo chamber. Everyone is well within their right to start a thread with such local rules if they like, but holding it up as an example of someone trying to find solutions is disingenuous at best.
You are incorrect. The initial poster had explained during that thread that they had tried before stating the persons must not make it personal or they must bring evidence to support their opinions. I have checked this as you can check on their previous threads. The continued ignoring their of their requests then they likely had no other choice but to prevent them from derailing and making it personal. I found their previous local rules to be very reasonable, in that anyone could post as long as they substantiated their claims and opinions with evidence of or a compelling case based on observable events.
I very much doubt eliminating 10 persons from the entire forum means they are creating an echo chamber.