Is correct grammar more important that the welfare of other?:
It matters to those of us who attended schools where all this was important, have or had parents to whom it was important and have jobs where it is important. If you can get through life without any of those applying to you, then you may well conclude that it is all somewhat irrelevant and who can blame you?  I think that by anybody's standards it is better to be a good and caring person than one with impeccable spelling and grammar. And having seen your original question, I think that you are worth twenty of those people who are so arrogant and superior about their command of language and who seek to put you in your place.  I'd rather have a good hearted neighbour any day than one with impeccable English!