bosh, I used to drink and bike. its not like that's uncommon. Give you a break? OKAY. you are certainly free to ride helemtless in lightly travelled Costa Rica, avoiding the oxcarts and the substandard bridge photos you post. American Suburban and city riding is a bit different, with different operating and safety parameters. There's your break.

I'm recommending riders wear a helmet.

Its not IF you crash, its WHEN you crash.