Nope. Tending a datacenter close to two decades, I can say that putting people behind NATs and in jails/containers/VMs doesn't prevent security incidents all the time.
With all the bandwidth, processing power and free cooling, a server is always a good target, and sometimes people will come equipped with 0-days or exploits which are very, very fresh.
Been there, seen and cleaned that mess. I mean, reinstallation is 10 minutes, but the event is always ugly.
