By affixing spelling and stabilizing it, you preserve access to the past generations' writings. By allowing changes, you end-up with incomprehensible documents
Hardly. Purists never will accept such change but that is how languages develop. Short forms in ancient Egyptian hieroglyphics eventually led to the usage of one symbol and a group of symbols used in conjunction to convey different meanings and express abstract ideas. This shortened form was frowned upon by the erudite of the Egyptian civilization too. I hate misspellings and 'lolspeak' as much as anyone else but they variations in language used by the masses lead to the evolution of language.
Politics: A strife of interests masquerading as a contest of principles. The conduct of public affairs for private advantage. -- Ambrose Bierce