Uhh No they have a secure network, but it wasn't as "Secured" as it should have been. The blame needs to be on the Hackers that did this, but Sony shouldn't be forgotten. Right now that's the biggest thing that disgusts me is people automatically blame the company for being robbed instead of the robber. Seeing some stupid posts saying it is Sony's own fault and serves them right when really the hackers are to blame for this. Sony F'd up and that is indeed correct however it does not make it right what happened to them or their customers.
There are enough people with enough motivations that any major security hole will, given time, be exploited. You put something on the internet, you're letting the world try and break it. Now, you can sit there and not bother to properly check your network, and then [censored] when it's broken, or you can do it properly. It is Sony's fault. Because they did it wrong. This is not somebody being mugged in the street, this is not a bank robbery, or a break in, this is somebody leaving their front door unlocked. Yes, they shouldn't have been burgled. No, your insurance is not going to pay out.
We do not live in a perfect world - that vulnerabilities will be abused is a given, and complaining when that happens is nowhere near as useful as actually looking to see if you have any vulnerabilities.
Stop defending Sony - they are not an innocent bystander here. By not following proper procedures they have put your data and finances at risk. They don't get to say "Well, if we hadn't been hacked...", because it *will* happen, and they should have known that.