What does Mr.Pumblechook make of the news thats a convict had stolen the food? What does his explanation reveal about him?

Mr.Pumblechook thinks the convict went down the chimney,

"Mr. Pumblechook made out, after carefully surveying the premises, that he had first got upon the roof of the forge, and had then got upon the roof of the house, and had then let himself down the kitchen chimney by a rope made of his bedding cut into strips; and as Mr. Pumblechook was very positive and drove his own chaise-cart—over everybody—it was agreed that it must be so..."

His explanation is rather far fetched and silly. Still the guy's force of personality seems to railroad over everybody else.