How does more melody make it less punk? A lot of modern punk bands have more melody and they still sound just as punk. From the ''Orgcore'' stuff like the Flatliners and Lawrence Arms, to the ''Crack Rock Steady'' ska punk bands like Choking Victim, to melodic hardcore like A Wilhelm Scream, to Hardcore like PEARS. melody in punk is a pretty normal thing now. (One of the more melodic and less aggressive pears songs:
https://www.youtube.com/watch?v=NbuVH5h_lEQ)
if this Jawbreaker song:
https://www.youtube.com/watch?v=4KGzXUmbyiQ
Is Punk Rock, than so is this later Green Day song:
https://www.youtube.com/watch?v=O1raCtM3UGk
The only real difference is that the latter has a fully clean voice as it's pop punk, but it's still punk.