Pink, as portrayed in the film, and to a lesser degree, on the album, is not Roger, but an amalgamation of Syd, Roger, and a fictitious character representing the band, and all rock stars. He is not portrayed as nothing being his fault. He is portrayed as deeply mentally ill, and quite toxic to those around him. He ignored his wife, long before she left him; he is given to bizarre behavior, that would frighten anyone around him, and he exploits/victimizes young groupies, and it is doubtful any of them would have good stories to tell about the experience.
All alone or in twos
The ones who really love you
Walk up and down outside the wall
Some hand in hand
Some gathered together in bands
The bleeding hearts and the artists
Make their stand
And when they've give you their all
Some stagger and fall - after all its not easy
Banging your heart against some mad bugger's wall