extremely poor airmanship
You may find that after you fit a radio and transponder into the glider (weight/cost permitting), yourself and others can have a greater awareness of what's going around?
If you're flying in uncontrolled airspace, anything else can randomly fly in it as well. I know it may not come across as something easy to digest.
Powered aircraft pilots (pistons, jets, etc.) could be equally concerned too. I've heard of someone who's been flying through cloud in Class-G and nearly had a glider wrapped around it. You cannot see-and-avoid in such conditions.
A solution is to have more controlled airspace in your area to keep things separated.
But pretty please - no more low-level class A. That kicks me (a non-IR pilot) out!