I see the security measures similar to protecting your home from burglary.
Is someone wants to get in, they will no matter what you do, so only thing you can do is put measures in place to make it a harder target in a hope they go elsewhere.
This may sound a harsh way to look at it, but as long as you aren't a soft target and have some protection in place then they will hopefully go elsewhere else-
So if it takes walk through metal detectors and scan bags then i dont have a problem with that.as long as not leaving the door unlocked so to speak!!