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What is the probability of one person wanting to do damage? Square that.

Now consider that even if two people wanted to do damage, each might not know and trust the other to allow them.

> What is the probability of one person wanting to do damage? Square that.

What's the probability of one person wanting to do damage and having a momentary opportunity to smack the other person in the head with a hammer? Substantially more doable.

But you've now significantly dropped your original odds because your person who wants to do damage now has to be willing and capable of serious violence.

Those systems are set up so that responsibilities are split; one person alone doesn't have the knowledge to knock everything out.

That would be difficult to implement in this case. How are you going to un-teach one of the team members that fire near computers is bad?

Separate rooms with separate access control for redundant systems. Preferably made so fire from one room does not spread to the next.

I think that's a different concept to the “Two-Man Policy/No Lone Zone” mentioned above.

Both.