Shh.
Listen.
Bill Clinton is totally unaware that anyone, ever, is watching his whereabouts. It's not like he has a permanent SS detail, and no one has ever written tell-all books about him, to, you know, cash in during election seasons.
Rather than using a telephone where no one would know that he even had contact with Lynch, he instead brazenly sought her out in public, because again, he doesn't have a permanent SS detail, no one ever talks about where he is or who he is meeting with, and he isn't really that famous. Almost no Americans know who he is, or what he looks like. And you know that Clinton isn't very outgoing, so he can essentially stealth into and out of any situation, because he's just so quiet and private.
And he did this, all so he could do something that cannot be done by using a telephone: say words to another human being. As of yet, scientists are unable to develop devices that allow one person to say words to another person from distance.
Or something.
Also: Benghazi. And, Vincent Foster.
Forever.