Originally Posted by
TheLoadbearer
After the elves brought demons, they put up runestones around Quel'thalas that prevented their magic from being detected by the Legion, and so the Legion never realized Azeroth was still around.
After the humans brought demons, they made a bandaid solution with the Guardian, trusting in their own prideful arrogance that they could handle whatever demons came along.
The elves basically put a sign by a cliff edge that says "Don't go near the cliff edge, you'll fall."
The humans parked an ambulance at the bottom of the cliff, saying "Oh, it's okay, this way, if people fall and get seriously injured, they'll get medical attention right away and be fine!"
The humans' solution was not at all a preventative measure. The Elves' was. The high elves fixed their leaky pipes, while the Kirin Tor just put a tiny bucket underneath to catch the water drips, not big enough to hold the drips for long.
And Aegwynn was arrogant enough to think she defeated Sargeras, and told the Council of Tirisfal to go to hell rather than give up her powers for the next Guardian, resulting in Medivh causing all sorts of catastrophic events.
At some point, the humans must be held accountable for their flagrant abuse of magic with no mind for the repercussions of their actions.
The Elves didn't take such extreme measures to control the humans, because Strom was already keeping them on a tight leash. They couldn't have known that the humans would go out on their own to do all the magic they pleased. Basically, they trusted the humans to exercise some form of caution and adhere to their own laws. Instead, the humans left and made up new laws that let them do whatever they wanted.