Seriously? You want to claim that all the monsters in Undermountain understand that attacking Waterdeep is bad for them? I love how the Kobolds, Oozes, Goblins, Constructs, Drow, Duergar ect ect all have an agreement to never attack the surface for their common good.
So, just to be clear about your claims.
You claimed that the halflings would be in land already cleared of monsters by the other races. In a part of the kingdom that is not on the frontier. Now there are threats that could be part of normal society. Things that could be in the small towns near the halflings. But the halflings are in the boonies, but not near the frontier, so they can't be threatened by things in the towns, or by things on the frontiers.
Centrally located away from the center? How do you picture this working?
But instead of claiming them as any sort of people, you defaulted to an animal. The only explanation I can think of is that you wanted them so far removed from any interaction with the society of the area, that you had to go to an animal, because any people would be considered part of the country being protected.
I'm warming it for everyone. Myself, my family, the dogs, the cat, the plants. And, even if I was warming it only for myself... I am still warming everyone else. We all live in the house. I don't get exclusive warmth for warming the house only for myself.
They don't require a self-preservation instinct? A worry about things killing them?
There is no "racial reasons" for wanting to protect your home and family. People want to protect their homes and family. Even the emotionless Lizardfolk have that instinct. And halflings... well, they have the emotional capability, but every time we put a threat up, you tell us how they won't ever actually be under threat.
They live too far away. They are too well hidden. They have nothing of value. They are too lucky. They are protected by the other races.
Every threat you have dismissed.
"Go forth and destroy the living, cover the land."
Every village, town and city adds more dead to wander the land. But somehow they are never going to go inbetween towns and cities?
Also, are you looney? Look at a map of any campaign setting. A thousand miles is bigger than just about any three or four kingdoms combined. Cormyr, the country you mentioned in Faerun, is about 500 miles at the largest. You want multiple thousands of miles of empty land?
Even Greyhawk, which is massive, even the biggest kingdoms are 800 miles across. Which is, by the way, the size of France, one of the largest countries in Europe.
If you want a kingdom to have thousands of miles of empty space, on top of villages, farms and cities, you have created what is usually referred to as a Massive Empire.
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They are going to go and fight a dragon to ask an object why flies are called flies. It is... nonsensical. It is randomness. They don't need to ask deep questions? That is more of a joke question. I'm not saying they need to ask what the meaning of life is, but you presented a motivation for leaving their shop, their home, and risking life and limb for a childish question that the DM isn't going to have a serious answer for.
Now, stepping back a bit because you've said it is a question you yourself have. I admit, I have an interest in the origin of words. I'm sure that I could do some google searching and it would be interesting, but you have to consider it in context.
"We are going to slay a dragon and recover a powerful artifact that can answer any question. I plan on asking of the location of my lost sister."
"I am going to ask where the sacred journal of a famed alchemist is buried."
"I am going to ask how to heal the sickness infecting my home."
"I am going to ask why flies are called flies."
That is jarring. It is a joke.
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Also, I notice you completely skipped and ignored all of my writing and math about the relative populations of halflings and half elves. Wondered how you would respond to that. Silence seems about right.