Wing suits are safe , just like skydiving is safe, base jumping is safe... What happens is you start pushing the limits... I know I use to skydive alot... With wings suits what happens is the openings are more import , so larger parachute is suggested.. Well that's not cool, everyone wants the small rig, faster to pack, better to swop...That's when trouble begins ...
My buddy use to jump with his wing suit at the beach with a base rig.... People would start running thinking he was going in, I've seen him pull under 200ft.. Pushing the limit gives you that high, so you keep pushing...
This is a great video, it's amazing to see just how far skydiving has come in the last 10 yrs with wingsuits