I don't think that there is any security that will keep the determined person out of a home but a security system of some sort would be a deterrent. If you live in an urban area, a security system could be beneficial as the police could be called to your home and arrive in a timely manner. If you live urban, a security system would not be of that much use as it would likely take the police too long to get there.
I live rural and have 5 dogs (by choice as I love dogs). I think that this is a great security system. I think that anyone would be nervous to enter my house, especially as all but one of my dogs are big.As for the robot sentry security I don't think that this is a viable solution at this time as the robot considered anyone who enters the area to be an enemy.
Perhaps in the future if the sentry robot becomes more sophisticated it could be worth considering for some areas.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.