He speaks like that because one of his family members growing up had a hearing and speech problem. So he exaggerates his speech in because that is how he grew up so that, the family member could understand him - not buying this.
Lett speaks 'like that' at every public talk he gives - his family member with hearing and speech problems isn't always in attendance, needing exaggerated speech to understand.
I read somewhere (on this site I think) many moons ago that he has a stuttering problem, and one of the suggested therapies for overcoming it is to exaggerate one's facial gestures while speaking - this is much more believable.
Are there any former bethelites on this forum who could confirm Lett has a stuttering problem?