"It's not invasive if you don't try to find out more information than is currently present." Stephen thought this was too much to worry about morals. "It's them or the world, what are you more worried about, Doctor Palmer, someone's intrusive thoughts or millions of lives?"

He doesn't know how accurate his scrying would be - there's a lot of distractions. He can portal though - without a sling ring though - once the location is pinpointed - if required.