In general? Many reasons, which are listed already. Specifically? Do you want political organisations weaponising your preferences and interests in an attempt

In general? Many reasons, which are listed already. Specifically? Do you want political organisations weaponising your preferences and interests in an attempt to manipulate your vote? Even if that means flat-out lying to you and others in an attempt to manipulate your behaviour by targeting your personal hot-button issues? Because this has happened a number of times already, and will continue to happen on ever-larger scales until the practice is banned.