Talking about well known socialists why are so many writers, poets, musicians and actors follow/support Labour. Some of their life style is hardly socialist either. Emma Thompson, Martin Freeman and Richard Wilson who all drive expensive luxury cars.
I think it’s more a case intelligent people know that no political “system” is ideal and I suspect the people you name rather than embracing hard left policies simply support a degree of equality and social justice - they probably also dislike the current incompetent corrupt administration (which paradoxically does not represent traditional conservative values).