Hello!
Try telling that to the German Airport security personnel.
Strange! I've been flying commercially in Germany since 1992. I only have a crew card since three years (my former employers - one of them myself ... - didn't care about such nonsense) and never had any trouble anywhere in Germany. Ever. Even now, I rarely show my crew card to anybody. Especially when we use a handling agent who escorts us through security. The same in most other european countries.