Searching for unsecured wireless networks, also known as wardriving, used to be a fun hobby, which can still produce interesting results. While wardriving is no longer as common, (major) organisations must always stay alert in case of 'rogue access points'. These wifi access points might have been brought in by an employee, or they might have been set up by a person with malicious intent.
The configuration of a wifi network is another frequent point of failure. While networks are no longer as insecure as in the past, many cannot accurately be described as safe, either.