I'm Probably Wrong
There is a reason why public speaking is a fear worse than death for most people. The human ego can rarely stand being judged and picked apart for all of its alleged flaws (not pretty enough, not charismatic enough, not smart enough, etc.) Given enough eyeballs and enough opinionated outsiders, they'll surely find something wrong. The pressure is increased with the quantity of eyeballs in the audience just waiting to catch us make a gaff.