Faraway places always seem so much better than where we live, don't they? But, experience is the best teacher. And it's my experience that while there indeed are better places to live than Delaware (for a host of reasons), for most places, it's a case of trade offs.
The desert, as you pointed out, has scorpions & black widows, in addition to some things you left off your list like venomous reptiles and oppressive, indoors-confining heat for much of the year. This isn't to single out the desert as the only undesirable living destination. I could say worse for Minnesota & the Dakotas. And, yes, even Florida and the Deep South (too many bugs and too much humidity).
As for Delaware, yes, winter always goes on two months after it got old. Every year, it seems. And summers are hotter and stickier than I would like. But again, it's trade offs. After considering all things, Delaware really ain't so bad. No cottonmouths. No gators. No scorpions. Mosquitoes are an issue for no more than 3 or 4 months. And roaches tend to be isolated to filthy homes and restaurants, rather than being ubiquitous, like in the Deep South.
When I knock a place, I'm not knocking the people who live there. Inhabitants can't control the climate, nor the creatures who share those places with them. And there ARE good things to be said for every region of the U.S. There are good and bad people everywhere. And every region has its share of both.
(Backstory: I've lived in PA, FL, and CA, so living in the West and the Southeast aren't just abstract concepts to me. I've walked the walk.)