They live in apartments that don't allow grilling so they never thought to buy one. And it being the winter, not many people who do grill in the summer have charcoal for winter grilling.
So when the power goes out, they can't cook anything on their electric ranges. If the water shuts off, that's even worse. Frozen food is useless if you can't even thaw it, let alone cook it.
Initially the weather reports I read said the winter storm warning only extended to Monday afternoon and now it's to Thursday, so lots of people didn't think to extend their emergency supplies to Thursday, and most probably didn't think they'd be without water and power.
I'm really lucky in that I have both water and power, but many are not. You really should not be judging people according to what the most privileged suburbanites can adapt to.
It’s like if I went to Canada and started shitting on people unable to deal with 110f weather without electricity .
Without adding heat, you're still not going to stay warm for long though. my window may have been bent so it couldn't close in winter throughout child hood, but we still had a heater on.
Watch out for your windows. Hanging stuff to act like curtains will help