"an intruder with hostile intent"
Yes, but are they really intruders. In most cases, they have been there for yrs, perhaps all their lives. Let's call the wt org a cancer. In a cancerous mass, if one of the cancer cells turns normal, is it an intruder? The hostile intent is purely incidental, a righteous indignation at finding out that they have been used, duped and treated like $#it. While someone working their way inside w hostile intent does happen, it's very rare.