John Humphrys' Lost for Words is a collection of such abuse to the English Language. He argues that inflexibility in a language makes it unpopular. However, that is no reason for allowing gross abuse.
People who say every rule should be observed meticulously do not know what they are talking about. And if you don't believe me, try "correcting" that sentence to end: "... don't know about what they're talking".
If we were indeed being oppressed, the liberals should have realised that the way to overcome our oppressor was to use his own weapon against him: good English. Rules do not confine; they liberate.
We talk of future plans and past history; of live survivors and safe havens. Children have temper tantrums and politicians announce "new initiatives" - though maybe that is to distinguish them from the many "initiatives" that are recycled versions of failed old ones. We say "from whence" and "he is currently the chairman..."