It is true that the relationship between them all had broken down in the last few years of the band, and that they kept their distance from him when off stage. That said, young teenage ‘groupies’ were a consistent backstage feature and his reputation for being a creep was well known. Hell, on LP fan site message boards ‘the younger looking the better’ was given as advice on how best to get his attention. He was openly referred to as a ‘pedo’. I doubt his bandmates knew about the extent of what he was doing, but there’s little chance that they weren’t aware of his behavior with teenagers.
IIRC Joanne would also post online about what he was doing, and she was constantly being attacked and dismissed as a crazy bitch. This was years before he was actually caught. The police didn’t want to investigate the ‘hometown hero, and they prosecuted her because they were furious at being embarrassed.