Although I do wear and strongly advocate bicycle helmets, I would also observe that bicyclists who tend to ride visibly, defensively, and vehicularly, i.e., safely, are more likely to wear helmets than those who do not.

As for the bike lane statistic, I cannot judge the 224-to-1 fatality ratio without knowing the ratio of miles of bike lanes to miles of streets in NYC. For those who always strive to position themselves appropriately on the road, the presence or absence of bike lanes may not be terribly relevant.