Language is always evolving. This is how various forms and dialects of the same language have developed… America and Australia were founded by the British, yet all three countries have different forms of English, and none of us speak the same English as the original settlers did.
I do get annoyed with common spelling and grammar errors (especially defiantly for definitely, and irregardless). However, the world is very different from just 50 years ago. Technological and scientific advances introduce new concepts and words into our vocabularies, and alter the meanings of some. I admit to using effect/affect in non-traditional ways. I use affect for subjective references, and effect for objective references.
One factor in the whole linguistic mish-mash that really irks me is marketing and commercialism that misspells words in order to trademark them. Then the population sees the trademarked form of the word emblazoned and gets confused when the time comes to actually use the word in writing.