Scenario 6: Flying in traffic

What if the other guy doesn't follow the right-of-way rules? What if the glider you're thermaling near takes a big collapse? What if you hit a pocket of sink as you're passing over another glider? Do you have enough clearance for any of these problems?
These are a few scenarios to think about. Trusting the odds doesn't seem good enough in paragliding, because the consequences of losing are so high. Always having a backup option seems like the only way to stay accident free in the long run.