Back to being serious on a serious subject... the problem truly resides in the glider pilot's abilities. I'm a power pilot as well as glider pilot. One of the most dangerous power pilots around is an IFR rated pilot that flys under the hood once in a blue moon to keep current and then goes into nasty conditions thinking they have the skills to handle it. Now just imagine a glider pilot that isn't IFR rated entering zero visibility having read the instrument manual with little to no practical experience (Condor or flight sims don't count). Tragedy is just around the corner. The point is to not get into that situation. This is the safest course of action. Follow the rules and be safe.
Craig