You miss the point here. It's not about getting hacked or so. It's their way of handling it. Like i said they kill it first and then tell you the reason why. What's the point in it ?
If they don't do this, then they run the risk of having their netblock(s) blackholed by upstream providers or other networks, which is bad for all of their customers.
They aren't responsible for making sure your system is secure, you are. You're a sysadmin now; it's not just a toy, there's responsibility too.
Killing it first is the proper course of action here. I understand you're new, so there's always a first time. I just disagree that you have to make an inflammatory blog post about it.