Personally I dislike losing but still enjoy the game, can't handle losing is also a bit of a strong word. You're never really going to set out to lose, the main objective is not to lose. Now sure losing and doing things a bit better each time is fun, but I whole-heartedly disagree with unfair losses being fun.
Now we're staying civil. I was worried we'd get mad at each other
I never said unfair losses were fun, honestly. I just said it was a mantra to COPE with it. I said unfair losses would happen for certain, and you'd need to be able to handle it to play (since they're going to happen). If you can't handle it, I don't think this is the game for you purely because when those unfair and brutal losses happen, if you can't handle it you may lose any desire to play again. Coping with "Fun" is a necessary part of playing Dwarf Fortress. The mantra "Losing is Fun", as I said, isn't to help with the learning curve but to help when you want to scream after losing all that time and effort due to something minor/unseen/unfair/generally BS.
If he has a backup save? Sure, but he might not of saved for a while...I've killed half the world on Adventure Mode, got the deadly bite of death from a bogeyman and I was done for, regardless of being legendary in most of my stats. It was unfair how I died, I forgot to save, it wasn't as fun as I was promised. Now yeah that's my fault for not saving. But why should this guy have to go back or even lose his entire fort if he hasn't saved, just for the sake of a spoiler?
This is why I said I personally think we should always advise a backed up save when discussing HFS. We don't even have to give away the magnitude, just "this next part can get ugly, prolly want to back up your save". In Curious Structures, the undead will be what he assumes are the "can get ugly". There's miasma, lots of baddies, and who knows what else. As for adamantine tubes, where there's magma, there's Fun. Enough said there I feel. If pressed for details, we can say that mining a vein that runs into magma is dangerous, probably should save for safety's sake. Save recommended, newbie spared spoilers, everyone wins.
He can save yeah, prepare for it, but not if he didn't know. As for explaining the sheer magnitude of what's underneath...Isn't...That kinda ruining the spoiler? What's your definition of a spoiler's purity?
I think I addressed this in my previous paragraph: we don't (and shouldn't) tell him the sheer magnitude. Just a gentle reminder from the veterans to save, and some perfectly plausible reasons based solely on what he can see already. If he chooses to ignore the advice of experienced players, then he deserves all the Fun he can handle.
Also, I feel it's valid to bring up the 2nd poster only spoiled it on the off chance someone did troll him into taking it. It's not like he set out to be an ass on purpose.
Maybe not, but a preemptive strike was a dick move. It also completely eliminates the OP's say in the matter. I, in hindsight, regret having the HFS spoiled for me. I personally have only myself to blame, but I'd be damned upset if someone took my say out of the matter and ruined it for me. His desire was to protect the OP from trolling, but he was too aggressive. Everyone has a right to enjoy the game, and there's no way of knowing if having surprises spoiled will affect that until it's too late, so I say err on the side of caution. If someone does troll him, you can always call their BS and correct the OP.