The quilt police are all nasty, critical, old witches with nothing better to do than tear someone else's work apart.
If one thinks of a police person as someone to turn to when in trouble - or as a mentor - than the term may not be so negative.
Another misconception: No one will notice a glaring mistake or shoddy workmanship.
A polite person probably will not mention it - but chances are someone will notice - if only the maker.