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"As it turns out, Google didn't only grab the hotspot SSIDs and MAC addresses with its Street View cars. As this article at CNET notes, Google also recorded location data of computers using wireless cards, as well as cell phones and other Wi-Fi devices. Google's explanation is that the data collection was accidental, and they declined to answer further questions from CNET."

Why are they doing that?

Here is why, connect the dots:
http://www.prisonplanet.com/articles/december2006/061206seedmoney.htm
http://www.threadwatch.org/node/9612
http://www.google-watch.org/jobad.html
There is a lot more down this rabbit hole if you do a Bing search etc...