So it's ok for me to throw rocks at your windows because you are obviously not smart enough to install bullet proof glass? This kind of logic can be applied to just about anything. Of corse when it's about hackers and viruses it's always blame the MS or blame stupid WiFi or whatever else comes to mind.
If I forget to lock my door, or I do not lock it properly, anyone has the right to go in my house and take my things? I dont' think so. Just because the door isn't secured, doesn't mean you can come in without a proper invitation.