I wasn't sure if the 'mad' was an antiquated way of saying 'metnal illness', or if the reader was supposed to be mad at them? I do enjoy this quote from ancien

I wasn't sure if the 'mad' was an antiquated way of saying 'metnal illness', or if the reader was supposed to be mad at them? I do enjoy this quote from ancient history >On the Internet there are enough people interested in becoming amputees to support a minor industry. One discussion listserv has 1,400 subscribers.