...they may indeed be thinking of ''remote employees'' like you. They have no idea what wireless networks you will connect to: home network, your neighbor's network, public hotspot, hotspot evil twin, etc. They have no idea how secure these potential wireless connections are.
Nevertheless, I do think it would be a courtesy to you for your employer to explain in advance why the wireless network adapter is disabled and what they expect of their remote employees in terms of safer computing habits. This could be a day-long seminar...hmmm, sacrifice a day of productivity?
Maybe the IT people at work can come up with a WIFI agreement for employees in your situation to read, understand, and sign. Maybe something that says you would only connect to your home wireless network, use WEP 128-bit encryption, MAC filtering, disabled SSID broadcast, strong router password, a WEP password rotation scheme, etc. Many IT folk just say fuggetaboutit and dump wireless.
On the other hand, maybe your computer work is not that sensitive and they are being overly cautious. Only you would know this.