The average person is probably less intelligent than the people surrounding you at home and work. Don't underestimate idiocy - though it's probably a combination of both.
After all, 90% of drivers have above average skill!
Edit: spelling.
I abhor the single-use plastic, but at the same time water balloons are just fun in the summer. If paintballs can be made biodegradable (they're gelatin), maybe there's hope for water balloons, too.