Should have said their rules aren't necessarily logical. Check out the wonderful, regular patterns for simple verb tenses in English: see, saw, seen; think, thought, thought; go, went, gone; am, was, was; drive, drove, driven; read, read, read (spoken differently); walk, walked, walked. Most follow "verb, verb-ed, verb-ed" or "verb, verb-ed, verb-en" but there are so many exceptions that it's almost funny.
How bout spelling? It's "i before e except after c" plus basic things like their, weight and neighbor.
Pronunciation? Try these: fish, laugh, distaff; glimmer, dimmer, women; pole, poll; pneumatic, knight, nick; very, berry, airy; devour, flour, flower; and many more.
Does that make sense to you? It's how languages are formed, by repeated usage and occasional,new forms made up by someone and repeated many times until it becomes accepted. No logic to it . . .