In 1st Edition my character's died all the time (random death was the norm in the 1st Edition I played

). Poison, swallowed by frog, killed by lightning from the gods etc. I just made a new one, which was a lot faster without having to pick skills or feats! And it was better then the cursed belt of gender neuter the elf ranger ended up with.
In 2nd I played a wizard who never got killed and made it to 7th level before the game broke up. Most times I DMed. Again, death was annoying but part of the game.
I'm DMing for 3.5 players now and some of them have a tough time with death. One character died from a random crit on his first adventure and he's been gone from the game for two months now after three years of gaming in my campaigns. I have actually only seen crits kill two characters in three years in a random way, so it didn't seem so bad to me. He disagreed and still twitches when anyone mentions water elementals (we're still friends, he just games with someone else now. It hurts, but I have to be fair to everybody and I couldn't change the situation for him while remaining fair towards the other's players).
Last adventure, three of five characters died. They went on the Glacial Inferno adventure from Dungeon. They knew about the Fire Lord, fire stuff, etc. but no one prepared. No resist fire spells, no bags of holding full of water, and few non-fire attack spells ready. I was stunned since this group worked its way up from 1st level and really knows better. The greater fire elemental tore them to pieces. Again, I couldn't fix it for them. They knew what they were getting in to (I don't railroad them through adventures) and had access to any gear/information/NPCs they might have wanted. They had an off night, but in a profession of kill or be killed an off night can destroy a team.
Tonight I'll see how the group does on an easier adventure (they are going to level back up before going after the Fire Lord again). They're broke (raise dead is expensive), owe a cleric a favor, and down levels so I'll be interested to see if they play well or just give up. I hope they overcome their mistake and go back to cram a boot up the Fire Lord's assets. I hate in when the bad guys win. Whatever happens I'll keep DMing fairly and letting the adventure unfold as character choice and random rolls dictate.