I think sailplanes have to be pretty safe. Because if it falls it will gain speed, which will be converted to lift.
So unless you do something stupid sailplanes can't just fall out of air. Am I right?
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No they can fall out of the sky if you mishandle them like any other airplane. They just happen to be missing an engine.
What makes them safe is low landing speeds and the ability for an experienced pilot to place it on the ground with extreme precision, with a huge choice of descent angles. If you are 1000 feet in the air, you have the option of landing almost under your nose using your dive brakes, or gliding 6-8 miles ahead, or anywhere in between.
As long as you have land-able terrain within gliding distance, and avoid stalling and spinning close to the ground (like any other aircraft), a glider is a low-stress, low risk type of aircraft. Serious cross country pilots "land out" in farm fields or outlying grass airports from time to time when they get caught low and away from the home field. It's part of the sport.