Problem is, despite the reprehensible conduct of Assange, he's not the real problem. Likewise, all of the posturing regarding the freedom of the press isn't the issue, either. At this point, all that's been found is a lot of embarrassing information regarding world leaders behaving badly when drunk, and other world leaders secretly saying things that others were already saying in the open-such as the suggestion from Saudi Arabia that the world would be a better place if Iran doesn't get nuclear weapons.
The real problem is stupidity, especially on the part of the person(s) in charge of the computers at that forward operating base in Iraq where the material was first stolen. Whoever was in charge of those computers did a number of really dumb things. First, they allowed computers with removable storage - in this case a CD-ROM drive-to be on a secure network. Then they had no protection against copying information, or any logging or intrusion prevention method of any kind. And then they let a clearly disturbed young man have access to highly classified information even after they knew he was highly disturbed.
Now, think about how this applies to your company. Very likely you have information on your computers that should not be seen by the outside world. Perhaps it's your customer list, or perhaps it's confidential information belonging to a customer or client, or perhaps it's financial transactions that are protected by federal law. Most companies have at least some information that must be protected, and while this may not qualify as critical to the national defense, it's still important.
Now, ask yourself if you have any computers with access to this information that also have removable storage? Ask yourself how hard it would be for a disgruntled employee to take your customer list and accounting data when they leave. If the answer is "not very hard at all," then you know where to get started to avoid stupidity.
So ask yourself a couple more questions: Have you run even a minimal background check on employees who handle financial information? Do you think it would be nice to know if any of them has a criminal record?
These are pretty simple questions, and if you aren't asking them about your own company, then it's time you should. But these are also the questions that the officers in charge of the computers in Iraq should have also been asking, and it's clear that despite the extremely high level of security that was supposed to be in use, it wasn't really there. This is just plain stupidity on their part.
But having seen how easy it is for someone to steal your most valuable information, isn't it even more stupid to fail to take action to make sure it doesn't happen to your company?