wedrifid comments on A sense of logic - Less Wrong

13 Post author: NancyLebovitz 10 December 2010 06:19PM

You are viewing a comment permalink. View the original post to see all comments and the full post content.

Comments (269)

You are viewing a single comment's thread. Show more comments above.

Comment author: Kingreaper 14 December 2010 03:16:08PM *  4 points [-]

Even if it's really a bad argument, the badness is far from obvious - just look at the Wikipedia page.

The fact that people are willing to believe something doesn't make it not obviously wrong. It just means they are, for whatever reason, blind to it's obvious wrongness.

For an example of why it fails in real-world terms consider the problem of coming up with the reference class. Humans? Great Apes? Apes? Mammals? Verterbrates? Earth-origin Living Organisms? Each produce a different prediction for the doomsday scenario, but a lot of plausible extinction paths for humans would at least take the rest of the apes with us.

For an example of why it fails the moment we have other evidence, consider Bob. Bob is 40 years old. He believes the doomsday argument. Someone points a gun at Bob, and threatens to kill him if he doesn't give up his wallet. Bob reasons "There's only a 0.001% chance that I'm in the last 0.001% of my life; so the danger of me dying in the next two hours is miniscule!". Is Bob right?

Now suppose that Sean has just turned 21, 3 months ago. Just become an adult. He concludes, from the doomsday argument, that as he's been an adult for 3 months, he has a 95% of stopping being an adult within 60 months, 5 years. So, he's going to die within 5 years?

A snap judgment cannot lead you from Zeno's paradox to discovering calculus.

No, but a snap judgement can lead you to correctly conclude that if each time you halve the distance you halve the time you're going to have a finite amount of time to cross the line, even if you have an infinite amount of instants.

Comment author: wedrifid 14 December 2010 03:44:47PM 1 point [-]

I've had prolonged debate with philosphers who honestly seem to believe that colour doesn't really exist. With Truthers who think that the US government bombed the main two WTC towers; but have no concept as to why the US government would need to do so.

Really? I'm not a Truther but I could come up with a just so story at the drop of a hat.

Comment author: Kingreaper 14 December 2010 05:03:58PM 2 points [-]

As could I. However the average truther has been convinced that it was done as an excuse to go to war.

But I deleted that part of the post for a reason. Politics is the mindkiller and all.

Comment author: wedrifid 14 December 2010 05:13:25PM 1 point [-]

but have no concept as to why the US government would need to do so.

However the average truther has been convinced that it was done as an excuse to go to war.

... Lost me. That sounds like a concept as to why to me. (Which is not to say that it is a likely possibility.)

Comment author: Kingreaper 14 December 2010 05:16:15PM 3 points [-]

There's no need to bomb the towers, risking discovery, when simply having the smouldering towers standing there will be sufficient excuse.

The planes, on their own, accomplish the "give the politicians an excuse" goal. Bombing the towers as well can't be explained by a goal that's already achieved.