Pace - Totally agree with your view on this, A midair will kill power and glider pilot without discrimination ! there are some purists who don't wan't to give up the right to fly imc in a glider and not carry a radio or talk to anyone ("no electric's dear boy !") - the glider equivelant of "skinny dipping"...or maybe they are just not aware of the danger they place themselves in when they fly IMC (although I doubt it because they must be experienced hands to be able to do that).
Common sense must dictate that skinny dipping whilst fun and exhilirating is also daft and potentially wreckless to self and others.
I have flown power and piston but both should be fun without threat of death due to others intransigence.
stay out of cloud or get a transponder / radar service