Author here. This is going to attract a few more downvotes for me, but I have to respectfully disagree. Partially because the scenario wasn't quite what had happened, but more importantly, even in situation exactly like what you have just described, I would not have just lashed out on my junior colleague - to me no matter how junior they are, they are still my colleagues and they still add value. There is no reason why I need to be aggressive to them when they made mistakes.
If you are paying for the servers out of your own personal funds, sure.
But if it belongs to the company employing you, no, it's not a personal thing, it's a corporate thing.
A server purchased for your work is not _your_ server. It is a company asset. If you buy a server for yourself and your little brother messes with it, go ahead and get mad and lash out. If your business has procured a new asset, you are tasked with managing it and someone else gets in your way (junior or not), deal with it like a professional.
I completely disagree with the idea that a work box should ever "belong" to someone.
Cattle not pets, man.
Sorry if this sounds tough, but that's the way it is.