With regards to home automation hacking that would really be down to a suitable firewall
I think you have to see it from the everyone's point of view, I would like to think that most installers would use a decent bit of signalling kit to protect high risk property with value, and a signalling kit proportionate to the risk in all other cases. This is why we do a risk assessment, the value of the contents dictates the likeliness of the system being compromised. You have to also take into account that some inside information is needed before any attempt can be made, you have to know that the system you have hacked is the same property you are trying to break into, you also have to know there is not another form of signalling medium protecting the property. As yet I havent seen anyone compromise a system this way, just because it can be done does not necessarily mean that it will happen, in theory I could survive a bungy jump it doesn't mean I am going to do it (And yes I know millions do but there have been many killed despite safety checks)