Re: Proprietary screws
Rock beats proprietary screws. If somebody has the time to unscrew a few screws and twiddle around inside to unlock the lock, the game has already been lost. That's just too fiddly. A good bash or pry will have that lock open without the need for a set of special screwdriver tips.
I had an occasion where a person locked a double gate on the other side and didn't put the lock at the end of each section of chain welded to the gates (again) and I was so pissed (in a hurry and didn't want to spend 10 minutes going around the long way through the other gate) that I gave the gates a big push. Snapped the hasp clean in two. Hmmmm. The mass of the gates coupled with the quality of the chain and welds beat the strength of the lock. We hadn't considered that before. I could have pushed the gates much harder than I did. We could have put a much more expensive lock on the gates, but then it would have been simpler to make a couple of strategic cuts to the chain link fence right next to the gate, peeled it back and driven right in.
Even if you clear a 1km free fire zone, install multiple fences, add tank traps, litter the space with land mines and add guard towers with armed soldiers, determined people will still get through. The cost and inconvenience of the security has to balance with the threat and the value of what's being protected.