Because cloaks should have pitfalls. By cloaking, you sacrifice your defenses in exchange for people not being able to re-acquire a target lock on you. Anyone who has a target lock on your <technobabble regarding tracking methods> would be able to keep their target lock on your <technobabble regarding tracking methods> because <choose one: modern scanners are just that good/cloaking technology adapted by humans isn't perfect/Freelancer's universe has weird physics>.
You're the one that threatened to blow me the next time you seen me F1 near a lane, and was really annoyed about me gate cloaking away from PvP.
Haha!
EDIT: and no I didn't F1 during player interaction or while I was fleeing, I got DC while I was camping a lane, and this guy happened to stumble upon my ship.