Perfectly valid point (about desirability of giving wide berth to winch launching sites), somewhat diminished by snapper1
shouting about it 
Some possible reasons ...
- people using GPS rather than chart? Few (if any?) GPS include gliding sites by default. I know I had to create my own waypoints for all gliding sites (easily done, but few users seem to bother).
- ignorance about gliding operations and possible dangers?
- charts do not make distinction between winch sites and aerotow only places (it's the winch cable, not the gliding that's the problem
)?
- lack of consideration for others (in all spheres of life)