If the humans or (other races for that matter) would not have used more arcane magic the demons would not be able to open a portal to Azeroth no matter how angry they were.

Uhhh...yaaaaaaaaa no. Illidan doing all that did NOT make him responsible for the orcs. The orcs were on a WHOLE different world before they came to Azeroth. And they could actually use arcane magic without the Well. The Well simply HELPED. Don't you wonder why people can use arcane magic in WoW, yet there aren't any Wells? Unless you count the Sunwell, which is btw DEFILED and the Maelstrom, and thats well...the Maelstrom...and remaining quel'dorei making a giant storm over Ashenvale has nearly nothing to do with the Well of Eternity, save that they didn't want the night elves turning it into a giant tree.

umm... all 3 wars were indirectly caused so hes not really at fault, u cnt

just to clarify how the overuse of magic led to the first orc invasion, by overusing magic humans brought the burning legion, led by Sargeras, to azeroth.

in order to fight the demons the Order of Tirisfal (a select group of powerful mages) created "The Guardian", a sigle being, chosen and imbued with imence power, and the guardian was charged with fighting the legion in a secret war.

this went on for thousands of years, untill the guardian Aegwynn, she was the one who fought the great Sargeras and she defeted him, at least his physical form, Sargeras hid his soul within Aegwynns' womb. Aegwynn then took sargeras' body and locked it within one of the ancient elven temples (lost in the sea due to the sundering of the world) and enchanted it so that no demon or being of azeroth could retrieve it

she used her powers to live for about 800 years, eventually the order demanded that she pass her power on, she refused to be controlled by the order, so in a last act of defiance, she seduces one mage known as Nielas Aran and conceived a child, who would be the last guardian

unfortuantly that child, one High Magus Medivh, was overshadowed by the soul of sargeras, thus making the most powerful being in the world also the most evil. medivh hatched a plan to retrieve the body of sargeras, and he found a being that the enchantment protecting it did not effect, the orc. so medivh built the dark portals and convinced the warloc Gul' dan to lead the orcs through to destroy the humans and eventually retrieve the body.

but, soon after the portals opened, medivhs plan was found out by his apprentice, Khadgar, khadgar had to kill medivh, reliesing both souls inside his body, the real medivh returned and is probably not evil anymore (lets hope).

so illy is barely responsible, id put the blame on sargeras

(p.s. i play on the server Medivh, first server to open AQ, eat it every1 else)