You seem to make it sound like whitehats can't secure themselves. "If you don't do it to yourself, then a blackhat will just do it to you"? Well, I'm definitely whitehat, so find a blackhat who can crack me.
"Secure" is an illusion. Nothing is truly secure, because there is always a way around.
Feel free to find a way into my network. Let me know when you do.
And you're right, if somebody is dedicated enough there is very little you can do against them. For example, you can find my address, fly to my house, kill my family, and gain physical access to my computers while I'm not home. How can I stop you? I can't. So yes, I'm not totally secure. But I'm reasonably secure.
Security is based on risk management. You ascertain the risks, and accept a certain level. That's what us "whitehats" do.
You whitehats have no clue about the 0days out there, though. So perhaps you aren't so secure afterall? Maybe from kiddies... but people who write their own exploits and don't post them on bugtraq can get into many systems. You're not a whitehat if you just secure your system, though. You're a whitehat if you contribute to the 'security industry', which would be posting 'useful' information on stupid BugTraq, and releasing vulnerabilities to the public (and letting kiddies get ahold of exploits). If you only know about securing your box, iago, then you're not a whitehat. You're just some dude who can secure his system (to the full extent of what is known). For instance, if you're running the current version of Apache httpd, you still are not safe from attacks to the Apache httpd, because someone could have found a vuln. And guess what, there isn't a patch out yet. So unfortunately, your only chance would be to plug the 0day vuln holes by coding your own patch.
But yes, other than that, you are right about the risk management part. And don't get me wrong, I said nothing about hacking you or anybody, iago. The little article was a joke.