Even at the start of Punk it was hard for us going to watch bands who were labelled as Punk because some were clearly not.
The Stranglers, The Jam, the Police and Squeeze were all labelled Punk (later New Wave) and it was very confusing.
The Sex Pistols always considered themselves a rock n roll band and when I bought their first single I remember saying they were 'Hawkwind with a crap singer'.
In the early days of UK Punk the only 2 bands that had that 'Punkiness' were The Damned and The Clash and everybody else was just chucked into that label, even Elvis Costello got lumped in at one time.
However, after that initial labelling and the media making people believe they could just pick a guitar up and form a band, this was the start of some real crap like The Slits, The Killjoys, The Adverts and so on who did have a punk attitude.