Hacker News new | ask | show | jobs
by pps43 3351 days ago
Not likely because of Hanlon's razor: "don't attribute to malice that which can adequately be explained by stupidity".

[1] https://en.wikipedia.org/wiki/Hanlon%27s_razor

3 comments

This takes precedence: "Once is an accident. Twice is a coincidence. Three times is an enemy action"

https://en.wikipedia.org/wiki/The_Moscow_rules

I think you meant to link to this [1].

[1] https://en.wikipedia.org/wiki/Goldfinger_(novel)

Like with birthday paradox, denominator is important. Considering how many large cities and days there are, this might not be an unusual coincidence.
The rule you quoted is not​ on the list there.
At best Hanlon's razor is a bet on the odds that most cases are stupidity and not malice (probably true). It doesn't mean there is no malice in the world and only stupidity.
Hanlon's Razor is not an established law of reasoning or of philosophy. Quoting it is not a valid counter argument without additional reasoning given.
That reminds me of this cartoon:

http://i.imgur.com/aI80YDO.jpg

That's why I said "not likely" rather than "impossible". It's just conservative Bayesian prior.

Remember last time nefarious hackers infecting computers at power plants were in the news, that later turned out to be antivirus finding some spam on completely unrelated computer?

It's hard to imagine you really understand Bayesian statistics when you mention what happened the last time as support for your point. It is quite hard to believe that you know with reasonable degree of accuracy the probabilities involved.
Ok I'll bite. Let's back of the envelope the probability.

In the past 17 years I experienced 5 blackouts, so return period is about 1,241 days. Among the cities that were mentioned, San Francisco is the smallest, with population about 865,000. Let's look at all US cities with population above 500,000. There are 34 of those.

The probability of having simultaneous blackout in 3 of 34 cities during 1,241 days is 1-exp(-C(34,3)/1241^2)=0.4%, or about 2% for the same 17 year period.

The above calculation assumes independence, but in reality probability is much higher because independence assumption rarely holds in real life. For example, we already observed multiple large cities in the Northeast having simultaneous blackouts in 2003.

Of course not, it's a colloquial heuristic. Do you disagree with this comment though? https://news.ycombinator.com/item?id=14168483
No. But it does not apply in this case. It may turn out to be coincidence or stupidity but claiming that it is likely to be thus because of Hanlons Razor is wrong and bad thinking.