Vera Lynn was one of them, she may have received more publicity than some others and became the poster girl and the Forces Sweetheart, but she didn't go into it coldly, as a "career move", she could have done plenty of other things for her career, she could have shot off the the States for one thing. and I don't think she has ever minimised what others did.
I don't know what there is to hate about her. You might find her songs and style over-sentimental now, but they were of their time, and they still bring a tear to the eye.
What is relevant now is, that she is still around - she has outlived most of those other brave souls who toured war zones to bring some cheer to the lads. So of course she is still the poster girl.