Just don't choose a game/ world which features death. You can roleplay gingerbread men in Candyland and never have the subject of death even brought up. Zero death in the gameworld means characters can never die.
If death exists in the gameworld, and characters are familliar with it then logically it could possibly happen to them. Getting upset over a character dying in world where death exists is like jumping off a cliff and blaming gravity for the painful landing.
That is so just so much BS just because DnD has rules for dying does not mean that you have to play it as written.
There is no difference in taking death out of the game then house ruling any other aspect of the game. The game I mentioned with the high body count was a 3.0 DnD game where the DM had house ruled out any kind of raise dead.
I have played plenty of fun 7 Seas where death is not part of the game and I have also played in several very enjoyable DnD games where we took death out and had faced other consequences for hitting -10.
Just because you can't see how it would be fun does not mean it is not fun nor did it makes us feel any less tension in battle.
Personally I think I prefer a game with other consequences to dying then a game where raise dead magic is available. Sometimes the raise dead just becomes so cheesy.
Sometimes death can really complicated the game. We play in heavy role playing games so the entire you look trust worthy join us does not fly. So the DM as to really work to introduce a new character. Then there is the whole wealth issue unless you bring the new character in with nothing or force the players to get rid of their fallen party member items the wealth level can really explode.
Then there has been the issue with what class the new character is going to be. Most of the people I play with don't want to play the same class so you often end up short a needed class or if you have a big group people stepping on each others toes.
I think there is as many good arguments in death being a pain in the tush as there are arguments for keeping it in the game.
In the end it comes down to what you want at your table. I prefer to run a game with very little PC death so it is hard to die in my game. It is possible but not likely. I have yet to hear a complaint about the game not being fun or the players feeling immortal.