Is it ever gonna be enough?
To me, yes, why not?
We are deterring human thieves, not Superman nor Supernatural.
And it's not like we are a billionaire family and our house is the one and only target the thieves(or kidnapper in this case) want.
These house-break thieves choose the easiest target and there'll always be easier targets as long as you keep yours secured even with one or two safety measures.