UNIX systems can be setup to be just as insecure as a Microsoft box. The President's Commission on Critical Infrastructure Protection observed that there are enormous vulnerabilities in power, telecommunications, transportation systems, etc. Again, we need better operating systems and networking security. ET Privacy is a serious problem. Any company that believes its e-mail is secure is in for a surprise.
Cryptography can help, but good crypto built into vulnerable operating systems is itself vulnerable.
A few people are becoming more aware. However, as huge numbers of new users are added to the Internet community, their lack of awareness complicates the problems. In many environments, a single lazy or unaware user may be compromising everyone else. The problems are only going to get worse, unless consumers begin to demand strong security from vendors. Again, see my Web site for the Illustrative Risks file to show the extent of the risks.