That is the sort of person Muriel is. People in her world blame each other for their own shortcomings. Muriel's love of slightly tacky ABBA songs, matching her questionable taste in clothing, is reflected Peter Best's score which relies heavily on ABBA songs and a score that relies heavily on dramatic variations on ABBA melodies. As the Australians do so well, this is not so much a good film but a clever reworking of a cliched plot. It takes several unexpected turns, but ends up where everyone knew it was going all along.
Progress is the mother of problems.