Anderson: Taking the long view, history shows that word usage and grammar rules are constantly changing and evolving-sometimes resulting in entirely new languages  Since they will change regardless of our efforts, we shouldn' t worry about violations of grammar rules  Lipton: That' s like arguing that we shouldn' t worry about enforcing laws since, in the larger scheme of things, laws change and nations come and go
But of course it is good that laws are enforced
users of a language can easily adapt to changes in that language