Nothing here is written in stone. If shitty people take over, there's absolutely nothing to stop them throwing out the rules as written, or just ignoring them.

But also: If the idea is that we should just trust the admins: Why have any rules at all?

All we have here is trust. These rules are more so the admins proclaiming their intended goals and actions. Again, there's nothing to stop an instance admin from doing whatever they want. Could it be more verbose? Absolutely. But as for the claims that the new rules show any deviousness on the part of the current admins, or that having better written rules will inherently protect anyone? Those don't really hold any merit, imo.