When the government went on it's spree, Illidan was pretty much entirely ignorant of what was going on. The half-demon didn't pay attention to current events.
It wasn't until they came for his church that he found out that something was happening. The government had been watching the church for a while, and they had an idea of what they were up against. Illidan was powerful, very powerful, but a raid of military men with advanced weapons was too much. He killed probably more than he should, but eventually he had to run, and he teleported out to the Himalayas. Now the well is being studied by the government, and Illidan is on the run. That's not wholly new, but without magic to suffuse his every waking moment, he's starting to lose it, hunting down vestiges of it where he can find it, and the demon has cast aside any of his attempts at playing nice, and instead he tracks and hunts down magic like a madman looking for every last little fix. If he can find enough, attain enough power then he can finally go home.
Illidan
It wasn't until they came for his church that he found out that something was happening. The government had been watching the church for a while, and they had an idea of what they were up against. Illidan was powerful, very powerful, but a raid of military men with advanced weapons was too much. He killed probably more than he should, but eventually he had to run, and he teleported out to the Himalayas. Now the well is being studied by the government, and Illidan is on the run. That's not wholly new, but without magic to suffuse his every waking moment, he's starting to lose it, hunting down vestiges of it where he can find it, and the demon has cast aside any of his attempts at playing nice, and instead he tracks and hunts down magic like a madman looking for every last little fix. If he can find enough, attain enough power then he can finally go home.