:cryvaultboy:
let me try to make this even more simple, in new vegas, the city prob is only gonna have like 50-100 people in it more or less, now that is only a representation of the actual number of people, in real life las vegas has over 500,000 people, even if there was a nuclear war the town would still have prob 10's of thousands of people, but obviously you can't really put that many people in a video game because of graphics limitations, same goes for the wasteland area. so no its not gonna be possible to wipe out every living thing around post nuclear war or not. you would run out of ammo and realistically someone would kill you and you would not really be a one man army wiping out the enclave or NCR etc, so respawning is necessary, its the only way to duplicate semi relalistic situations, in real life the strip would have hundreds of people around even in a post nuclear war, but obivously the graphics of a video game can't handle that.
*sigh*. You don't seem to get it - I agree with that the numbers we see in the Fallout games aren't the true number of people there may actually be. Plus, your calculations may be erring on the optimistic as well, as you may underestimate the wasteland's ability to keep the people count down to a low

.
Be as it may... Realistic or not, as a player, one wants to feel that ones actions has effects/consequences. This was especially the case in Fallout 3, where we weren't quite shown/told the full effects of the player's actions through an ending and thus, the world itself has to show it, but it only does so to a limited degree. Thus, if we spend time cleaning out super mutant sin the Capitol, for example, then we want to see it have an effect, too, not seeing it constantly respawn.
You point out that respawning is realisitc. But, as I pointed out in an earlier post above, several of the factions have manpower problems/can't replace their troops so easily, thus, seeing the respawns cease after a while or never occur at all is a realistic idea too.