Everyone should go to ski-injury.com and educate yourself on the actual data out there.
There has been zero reduction in fatalities since the introduction of helmets in snowsports, despite their increasing popularity and the exponential use in recent years.
Helmets are only rated to protect in impacts up to 12mph. In order to protect in impacts larger than that they would have to be huge, thick and heavy (think motorcycle helmets).
There is a profit motive at play here. Helmets have existed for a long time, but have only recently begun to find their way into snowsports, why? Greed. Someone saw an untapped market and could not care less about your actual safety. Follow the money.
Skiing is an incredibly safe sport, with a very low injury/fatality rate compared to things like soccer, basketball, and driving (which by the way would actually see a reduction in injuries if we were to require helmet usage there, but car manufacturers understand that this would have a negative impact on car ownership so it's never even been hinted at).
Lastly if you really want to have some peace of mind, even if it is a bit of an illusion, why not buy yourself a
D3o hat?
Don't take my word on it, do your own research, make up your own mind for yourself and ultimately don't hate on other people for their choices. If you want to wear a helmet that's cool with me, it is useful for bashing those tree branches out of the way and mounting your gopro to, also I hear they are quite warm and sometimes come with steezy built in headphones. I choose not to, however, as is my right.