I support the rule. I do understand objections against it, but they don't change my opinion.
A definition from trolling, taken from Wikipedia, is "a person who starts quarrels or upsets people on the Internet to distract and sow discord by posting inflammatory and digressive, extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the intent of provoking readers into displaying emotional responses and normalizing tangential discussion, whether for the troll's amusement or a specific gain.”
Why would we want it to be easier to enact this type of behavior? If a person in my home were engaged in this behavior, they would be invited to leave and not return. The same goes for my place of business. And the same went for my fraternity house. And if I found a method through which people could more easily gain access to those places specifically to engage in that activity, I would take steps to minimize that vulnerability. That is what had happened here. I don't understand why this is a problem.
I do understand that it may place a burden on some people to deal with a different protocol. Security and convenience have always been at odds and that isn't going to change in the foreseeable future. I understand that those that have never posted are not as vulnerable to this specific unpleasantry. If they are truly contending that making three posts is too onerous a task for them to manage for the sake of those that are vulnerable, what does that say about them? I get that they aren't a part of the problem, but there are times in societies that people have to do things that do not directly help them, but rather help the society as a whole. And this is a society.