It really surprises me (negatively) that most Ubuntu experts seem to
agree on this design decision. Isn't a well accepted fact that security
can affect usability?.

Now, about:

> We assume that the people who share the machine are either trusted, or
in a position to hack the machine (boot from USB!) trivially.

That assumption is not correct for me, for example, when I lend my
computer to someone else, I don't usually trust them completely (so I'm
still sitting near enough so they can't boot from an USB without being
caught) and I just want to share with them the minimum they need to get
their work done and having access to my personal files is not part of
what they require.

And about:

> Now, in a more complex environment, like a university machine with
many users, people do not have access to the hardware and can't easily
root the box, but they also have the sysadmin skills to change the
default permission.

I think that it doesn't hold a totally valid point as sysadmins like me
tend to think that the default system settings are always secure enough
for most regular deployments, so you don't think it is a good idea to
change those settings unless you've read a thread like this one... which
not everyone is willing to look for and then read.

Finally, it seems to me that this default setting damages Linux
reputation (for non-experts) of being a secure OS.

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https://bugs.launchpad.net/bugs/48734

Title:
  Home permissions too open

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