Because its just noise to non-tech people.<p>It&#x27;s the same reason why email accounts have 2,000 unread inbox messages or 30 notifications at the top of their phone. You get so used to seeing the notification that you begin to ignore it. In this case, you see a string of non-readable text that makes up some weird &quot;signature&quot; at the bottom. The conclusion? &quot;Oh. The signature is there. It&#x27;s been authentic every other time I checked. Why wouldn&#x27;t it be authentic on the 101st check?&quot;<p>Humans are the hardest vector to defend in an attack. Never underestimate the laziness of people - even when a simple solution exists to combat the problem at hand.