Another explanation that makes more sense to me is it was done intentionally to make it harder to decipher. When I was young our newspaper used to have cryptogr

Another explanation that makes more sense to me is it was done intentionally to make it harder to decipher. When I was young our newspaper used to have cryptogram puzzles in them based on a simple substitute cipher. The first thing you look for is repeating letter patterns like double letters and common word patterns like words ending in 'ing' or 'tion' for example. In his cipher he tends to drop a letter in words like 'button' and adds double letters to words that don't have them. Plus in his plain text letters to the press and police he tends to spell everything correctly.