or they just don't have the right tires.
Yesterday my wife and I went to the grocery store. There is a little incline to enter the complex... maybe 100 feet long. Two sedans and a truck were ahead of us. All three went about halfway but couldn't go further. They backed down to find another way in while we waited our turn to enter. As soon as they were clear of me we went up the hill without any sliding and didn't lose traction. I have tires rated for mud and snow but also took a line that hadn't been touched much (tires were hugging the curb) because most drivers just follow where they see the most worn down tracks.
You can get around in the snow we have right now but it helps to be familiar with winter driving.