If they hadn't disabled Wikileaks accounts there would have just been another topic just as controversial that would have gotten a bug up hacker's asses. This isn't a story about Wikileaks. Wikileaks is just the handy example. This is a story about how small numbers of people can have a temper tantrum and produce a global impact.
You can't reason backwards and say "well if they just hadn't done X everything would be fine" The parent's point is if they start reasoning like that, they'll just toss out anybody vaguely smelling suspicious (which I also think is the logical result, along with increased black lists of IP addresses)
That's just not true. There has neither been a reaction of this kind for other "bugs up hacker's asses" nor has there been an issue this controversial for a very long time. I can't think of any... perhaps the Morris' worm or Kevin Mitnick.
No there hasn't been a story like this -- ever. That's what makes it an interesting story.
Expect more like this. Eventually we'll get around to some issue that you can't feel so self-righteous about pursuing. Then the shoe will be on the other foot.