When I die on the rivets, even when it's a semi-screwing, I can usually say "I could have done 'x'," or "if I had paid more attention, I would have tried to weave instead," or whatever.
I always feel more helpless on conveyors. When they shoot out of the oil can as if they're racing each other to the bottom, a lot of the time there is literally nothing you can do! You're just gonna die, and that's it. It feels more unfair than anything else in the game.