Well, N towers are supposed to be enough. That’s the reason you should have N+1 in the first place.

Also this assumes that you can repair/replace a tower faster than it takes on average a tower to fail.

Well, if your infrastructure is mission critical, then you need one more as spare.

In this case a new one a qarter mile to the side with a redundant power supply. Mission control could be smack in the center between the launchpads.

Of course someone®©™ has to make sure, that the whole facility is only utilized in such a way that n-1 launchpads is considered 100% usage.

Rant/advice over from someone working in a data center, where spare machines are always in use, because someone©®™ said moar power is more important then reliability.

Well, the logic in polkit is, if you have direct physical access to the machine (not SSH, actual keyboard, and so on), in general nothing stops you from just pressing and holding the power button. So giving a local user the right doesn’t make worse.

To disable the behaviour you need to find the appropriate polkit rule in /usr/{lib,share}/polkit-1/rules.d and create a file with the same name in /etc/polkit-1/rules.d pointing to /dev/null.