I will put it forward that SNOW tires aren't required in most of the US because you have plows. Ice tires on the other hand? That polished, slippery-er than ice hard packed snow they leave behind? Yea, ice tires.
Beyond that, I don't think people are listening to the fact that ice/snow tires have significantly better dry/wet pavement performance than all seasons below freezing.
I've driven in Alberta winters with all-seasons (-50*C weather at times, constant polished icy roads with the occasional foot or two dump once a month). It's not like you are going to die and spin out of control (and this was in Fireflies/Sprints), but winter tires made winter driving that much more enjoyable. You won't be that asshat that causes everyone to miss a light because it took you 3 minutes to get across an intersection from a standstill.
If you do go with one of the newer all seasons (Hankook and Kumho make them I believe) that are specifically designed to include "winter" in their all season design, expect a shorter lifespan. The fact is, I can get 195/60R15 winter tires studded, mounted and balanced from walmart for $400. 175/70R13 sized for an economy car from the 80's/90's? $300 or less (in FRIEKIN CANADA). There is so little reason to not do it unless your snow/ice doesn't stay on the ground past a day or two. If you consistently have snow/ice on the ground, they should be a purchase you make.