[midoridensha]

>2 seconds later she hit a bump on the pavement with her foot and fell down hard (she even made a loud splash sound as she hit the ground). No, she didn't have a helmet. Should she have?

Did she hit her head? Humans are hardwired by millions of years of evolution to protect themselves in falls using their arms and hands; they generally handle falls very well. Humans have not evolved to handle riding bikes, and using your hands to protect your head in falls isn't instinctive there like it is while running or walking.

>No, its not. The person who says this probably hadn't ridden a bicycle in their life, or if they have, not often and not recently.

This is just stupid and argumentative. Road surfaces are frequently bad and people make mistakes.

>Of course, if you are afraid of falling or uncertain of your skills on the bike, wear a helmet by all means.

Yes, because I'm sure you're such a perfect rider who never makes a mistake.