That doesn't justify not giving the option to disable it.

Uh, are you saying s/he should keep the network connected because other people want the data s/he will provide by driving around with the network on?

Most people would like live traffic information.

Most people would not like to feed their location data to "the cloud", or open their car to anyone with an exploit in their pocket.

Traffic information can be distributed to cars via one-way mechanisms without sacrificing privacy -- using mechanisms such as FM RDS and Satellite Radio.