[ricardobeat]

What kind of daily security setup can protect against 5 gunmen with AK47s?

[ip26]

You don't necessarily need to meet them head-on & emerge victorious, just delay them long enough for backup to arrive and/or deter them, again by showing that you will delay them.

[thecrazyone]

Why aren't autonomous or remotely controlled rovers, or turrets ever installed?

[vsl]

Armed and trained security detail/guards.