Interestingly, this is kinda one of the reasons this Voldemort impresses me. EY writes that "more than your own life has to be at stake", but Voldemort was sane enough that caring about his own life was enough to get him thinking and to get him moving.

So much so, he ended up genuinely working to save the world, and indeed ended up doing so, or at least significantly helping (Harry's Vow). Sociopath or not, the fact that normal people aren't sufficiently motivated by risk to their own lives is not a strength.

Also, Riddle's care about his own life didn't look like a mere animal flinch away from death; he seemed to find meaning in his works towards that goal:

He paused in his Potions work and turned to face Harry fully; there was a look of exultation in the man's eyes that Harry had never seen there before. "In all the Darkest Arts I could find, in all the interdicted secrets to which Slytherin's Monster gave me keys, in all the lore remembered among wizardkind, I found only hints and smatterings of what I needed. So I rewove it and remade it, and devised a new ritual based on new principles. I kept that ritual burning in my mind for years, perfecting it in imagination, pondering its meaning and making fine adjustments, waiting for the intention to stabilise. At last I dared to invoke my ritual, an invented sacrificial ritual, based on a principle untested by all known magic. And I lived, and yet live." The Defense Professor spoke with quiet triumph, as though the act itself was so great that no words could ever do it justice.