Linguists usually don't make judgements about language, they describe the facts of language use and come up with theories to explain them. It's hard to argue that a certain word should not exist if it is used and is comprehensible. For instance "irregardless" has been in use since at least 1927. If it's not a word, what is it?
On the other hand, people make mistakes, and linguists account for this as well. You might be interested in
eggcorns, which are interesting reanalyses and respellings of words and phrases.